Neometrix / Oxygen & Life-Support Overhaul / Aircrew Oxygen Mask Overhaul & Test Facility / NMX-OMR-40

NMX-OMR-40 · ENGINEERED TO ORDER — OVERHAUL LINES · OXYGEN-CLEAN ROOMS · TEST & CERTIFICATION

In unserviceable. Out certified.

Name: Aircrew Oxygen Mask Overhaul (ROH) & Test Facility
Brand: Neometrix

An aircrew oxygen mask is life-support that gets worn, sweated into, dropped and stored. Every mask that comes off an aircraft is either restored to a known condition or scrapped. There is no third option, because the next person to wear it is betting on it.

An overhaul line is how a fleet does that at scale: receive, strip, clean, inspect, repair, reassemble, test — and certify. We engineer the whole line and the test facility that proves it; the airworthy parts come from their approved makers.

Discuss a facility Capability note (PDF)

An aircrew oxygen mask overhaul workstation: a clean stainless bench with a mask disassembled into its shell, valves, diaphragm and harness laid out in parts trays under bright even light

Fig · 01 — The strip station. A mask reduced to its parts is the only honest starting point — you cannot certify what you have not seen.

The item

aircrew oxygen masksand portable oxygen cylinders

The job

restore and provenot repair and hope

The discipline

oxygen-cleanno hydrocarbon, anywhere

The output

a certificateand a record that survives audit

Status

engineered to ordersuccessive-quoted class

ISO 9001ISO 14001Oxygen-clean processApproved-data certificationFacility engineering

Overview

Why a mask cannot simply be repaired.

The difference between a repair and an overhaul is the sentence at the end of it.

An oxygen-clean cleaning station: stainless sinks and ultrasonic baths with covered tanks, drying cabinets and lint-free wipes on a spotless bench in a bright clean room

Fig · 02 — The oxygen-clean room. Cleaning is not tidying — it is a controlled process with a verification step, because oxygen and hydrocarbons do not mix.

A repaired mask works. An overhauled mask is known to work — and can be shown to have been, years later.

Life-support wears out

Masks live hard lives. Rubber perishes and takes a set. Valves stiffen with sweat and salt. Harness webbing stretches. Hoses chafe. Shells crack where they are gripped. None of it is dramatic, and all of it degrades the seal and the flow the wearer depends on.

The failure mode that matters is quiet. A mask that leaks slightly, or breathes a little harder than it should, will not announce itself — it just gives the wearer less oxygen than the schedule promises, exactly when that margin is the thing keeping them conscious.

An overhaul ends in a signature

So the fleet does not repair masks. It overhauls them: takes each one back to component level, restores it to an approved build standard, proves it against the approved data, and certifies it serviceable with a record attached.

That certificate is the product. Everything else on this page — the layout, the clean room, the tooling, the benches — exists to make it honest.

Where this sits

Three neighbouring things are often confused. The test bench as a piece of equipment is the component overhaul test benches page's subject. Pre-flight verification of already-serviceable masks belongs to the ground half of the aircraft oxygen system. This page is the third thing: the repair line that takes an unserviceable item and returns it to service.

Strippedto component level, every time

Cleanedoxygen-clean, then verified

Testeddelivery, resistance, leak

Certifiedagainst approved data, recorded

The line

Six stations, one direction.

An overhaul line is a one-way street. Nothing moves backwards, and nothing skips a station — which is what makes the certificate at the end mean something.

FIG · 02AIRCREW OXYGEN MASK OVERHAUL LINE · RECEIVE / STRIP / CLEAN / INSPECT / REBUILD / TEST & CERTIFY — OURS vs APPROVED-MAKER

The station outsiders underrate is the first one. Quarantine is what stops an uncertified item drifting back onto a shelf of serviceable stock — a paperwork failure with a life-support consequence.

1 · Receive & quarantine

Unserviceable items are booked in, identified and held physically apart from serviceable stock. Separation is the first safety feature of the line, not an administrative nicety.

2 · Strip

Each item comes apart to component level with the right tooling, so nothing is judged through an assembly. Parts are kept together and identified to their item.

3 · Clean

Components are degreased, washed, rinsed and dried to an oxygen-clean standard, then the cleanliness is verified — because a trace of oil in an oxygen path is a fire risk, not a blemish.

4 · Inspect

Every part is judged against approved criteria under good light and magnification: perished rubber, cracks, wear, corrosion, damaged threads. The verdict is accept, repair or scrap.

5 · Repair & rebuild

Approved-maker components replace what failed, and assemblies are rebuilt to the approved build standard, with traceability running from each part to the finished item.

6 · Test & certify

Delivery, breathing resistance, leak-tightness and valve function are proven across the schedule. Only then is the item certified serviceable, tagged, and its record closed and kept.

Work content

What the facility contains, element by element.

Read the last column honestly: it marks what we engineer and what is sourced from approved makers.

An oxygen mask test bench: a compact console with plain-faced pressure and flow gauges, calibrated regulators, a breathing-simulation connection and a mask coupled to a bench test adapter

Fig · 03 — The test station. Delivery, resistance and leak-tightness proven across the schedule — the evidence the certificate rests on.

Element	What it does	Ours / sourced
Line layout & flow	one-way movement, no backtracking	ours to engineer
Receipt & quarantine area	keeps unserviceable apart from serviceable	ours to design
Strip stations & tooling	disassembly to component level	ours; approved tooling sourced
Oxygen-clean room	degrease, wash, rinse, dry, verify	ours — process and plant
Cleanliness verification	proves the clean, rather than assuming it	ours to specify and install
Inspection stations	lighting, magnification, approved criteria	ours to engineer
Mask components	diaphragms, valves, harnesses, hoses, shells	approved makers
Rebuild stations	assembly to the approved build standard	ours to engineer
Mask test bench	delivery, resistance, leak, valve function	ours to build & integrate
Cylinder work	hydrostatic test, valve overhaul, recharge	ours to integrate
Calibration regime	keeps the benches themselves honest	ours to establish
Certification & records	serviceable tags, traceability, audit trail	ours to establish
Training & documentation	technicians run it; records survive audits	handed over with the facility

The row that decides whether a facility is real is cleanliness verification. Anyone can wash a component; a facility that can prove it is clean is one that can certify what it ships.

Full specification — expand

Facility	A repair-and-overhaul line for aircrew oxygen masks and portable oxygen cylinders with the test facility that certifies them: layout and flow, receipt and quarantine, strip stations, oxygen-clean room and cleanliness verification, inspection, rebuild, test benches, calibration, certification and records — engineered and integrated as one capability
The One Idea	In unserviceable. Out certified. An overhaul ends in a signature that puts a life-support item back on an aircrew member’s face
Why Overhaul	Rubber perishes and takes a set, valves stiffen with sweat and salt, webbing stretches, hoses chafe, shells crack — and the resulting failure is quiet: slightly more leak or resistance than the schedule allows, exactly where the margin matters
The Flow	Receive and quarantine → strip to component level → clean to an oxygen-clean standard and verify it → inspect against approved criteria → repair and rebuild with approved-maker components → test across the schedule → certify and record. One way, no skipped stations
Oxygen-Clean	Degreasing, washing, rinsing, drying and verification, with compatible materials and lubricants throughout — because high-pressure oxygen with any hydrocarbon is a fire and explosion hazard, not a housekeeping matter
Test Content	Delivery, inhalation and exhalation resistance, leak-tightness and valve function, proven across the schedule on calibrated benches before anything is signed
Portable Cylinders	The same line handles portable oxygen cylinders, adding hydrostatic testing, valve overhaul, internal cleanliness and recharge to the flow
Certification	Serviceable tagging and certification against the approved data, with traceability from component to item and records that survive an audit years after return to service
The Boundary	The test bench as equipment is the component overhaul test benches page’s subject; pre-flight verification of serviceable masks is the ground half of the aircraft oxygen system; this page is the repair line that returns an unserviceable item to service
Honest Scope	Ours: facility engineering, layout and flow, the oxygen-clean process and plant, tooling, inspection and rebuild stations, test benches, calibration regime, certification process, records, training. Sourced: the airworthy mask and cylinder components, from their approved makers
Sensitive Boundaries	No aircraft type, customer, depot, order number, part number or specification figure appears on this page; the facility is described at capability level and built from Neometrix’s own competence rather than any tender or enquiry document
Status	Neometrix has quoted against successive aircrew oxygen mask and portable oxygen cylinder repair-and-overhaul setup requirements — the overhaul line and the test facility that certifies it — offered as facility engineering, indigenisation and integration, with the airworthy mask and cylinder components sourced from their approved makers, and no delivered overhaul facility is claimed.

Configurations

One discipline, four ways to buy it.

A depot rarely needs everything at once — it needs the part its backlog is stuck behind.

Mask overhaul line

The complete flow

Receipt and quarantine through strip, clean, inspect, rebuild, test and certification — the whole capability, laid out as one one-way line.

Cylinder overhaul

The pressure side

Portable oxygen cylinders: hydrostatic testing, valve overhaul, internal cleanliness and recharge — sharing the same clean discipline and records.

Test facility only

The proving half

The benches, the calibration regime and the certification process, for a depot that already strips and rebuilds but cannot prove the result.

And the fourth: a turnkey depot setup — line, clean room, benches, process, records and trained technicians handed over as one working capability rather than a room full of equipment.

Where it fits

Wherever a fleet must keep its own masks flying.

The demand comes from operators who would rather overhaul at home than ship items away.

Air force depots

Base and depot-level repair organisations that hold the fleet's life-support items and must return them to service on their own schedule.

Naval air arms

Salt, humidity and shipboard storage age masks faster — and a ship's cycle rarely waits for an item to travel to another country and back.

Indigenisation programmes

Setting up a national repair capability where items were previously returned to their maker — the requirement class behind this page.

MRO organisations

Third-party maintenance houses adding life-support items to their approvals, who need the process and the records as much as the benches.

Trainer & transport fleets

High-utilisation fleets cycle masks constantly; a local line turns a long shipping loop into a short internal one.

Portable oxygen holdings

Walk-around and casualty oxygen sets need the same restore-and-certify treatment, plus the cylinder pressure work.

A certification and records station at the end of an overhaul line: a clean desk with a finished aircrew oxygen mask in a sealed clear bag beside blank serviceable tags and a closed record folder

Fig · 04 — The end of the line. Bagged, tagged and recorded — the item is serviceable because it can be shown to be, not because it looks it.

FAQ

Common questions.

Longer answers, for readers who want the reasoning.

Q · 01 What is the difference between repairing a mask and overhauling one?

Evidence. A repair fixes the fault someone noticed: a torn harness gets replaced, a sticking valve gets freed, and the item goes back into use working better than it did. An overhaul makes no assumption about which parts are good. The item is taken back to component level, every part is cleaned and judged against approved criteria, anything outside limits is replaced with an approved-maker component, the item is rebuilt to an approved build standard, and then it is proven on a calibrated bench across the whole schedule before anyone signs for it. The difference matters because of how life-support fails. A mask rarely fails obviously; it drifts — a perished diaphragm here, a stiffening valve there, a slow leak past a worn seal — and the wearer gets a little less oxygen than the schedule promises without ever being told. A repair addresses the symptom that was visible. An overhaul restores the whole item to a known condition and produces the record proving it, which is what lets a fleet trust an item it did not watch being worked on. That record is also what an auditor will ask for years later, long after everyone who touched the mask has moved on.

Q · 02 Why does an overhaul line need its own clean room?

Because the item's working fluid is oxygen, and oxygen changes what dirt means. In an ordinary workshop, a trace of oil or grease on a component is untidy. In an oxygen system it is a fire and explosion hazard: oxygen does not burn, but it makes almost everything else burn far more readily, and under pressure a smear of hydrocarbon — or even a fingerprint — can ignite from the heat of compression or a spark and burn through metal. An overhaul line therefore cannot simply wash parts. It needs a controlled oxygen-clean process: dedicated degreasing and washing with compatible agents, thorough rinsing and drying, dedicated tooling that never sees ordinary lubricants, compatible materials throughout, and clean conditions for assembly. And critically it needs a verification step — a means of showing the components really are clean, not just believing they are, because cleanliness is invisible. That last point is what separates a facility that can certify what it ships from one that merely hopes. It is also the discipline this company already works to across its oil-free, high-pressure-gas systems, which is why the clean half of this facility sits naturally in our competence.

Q · 03 What is actually tested before a mask is certified?

The things a wearer would notice only when it was too late. Delivery: does the mask pass the oxygen it should, at the flows the schedule calls for, without starving the wearer at demand. Breathing resistance: how hard it is to inhale and exhale through the item, measured in both directions, because a mask that breathes heavily exhausts aircrew and is often the first sign of a perished or misassembled valve. Leak-tightness: whether the mask holds what it is given, tested both for outward leak and for inward leak that would dilute the oxygen with cabin air — the failure that quietly undoes the whole point of the system. Valve function: that the inhalation and exhalation valves seat, open and close as they should, in the right order, every breath. Around those sit the boring necessities: the correct build standard, the harness and hose condition, and the identification and traceability. All of it is measured on calibrated benches against the approved data for that item — not against a technician's judgement of what feels right — and the numbers are recorded, because the certificate is only as good as the evidence behind it.

Q · 04 How is this different from your component overhaul test benches page?

One is the instrument; the other is the whole workshop around it. The aircraft component overhaul test benches page is about the bench as equipment: the rigs that exercise an aircraft component and prove it against approved data, across families of components including pneumatic and life-support items. It answers the question “what do I test this on?”. This page answers a different question: “how do I run a repair line that takes an unserviceable mask and returns it to service?” — which needs the bench, but also the receipt and quarantine discipline, the strip stations and tooling, the oxygen-clean room and its verification, the inspection criteria, the rebuild standard, the calibration regime, the certification process and the records. A bench without that line around it proves items nobody restored; a line without a bench restores items nobody proved. The two pages are deliberately kept separate and cross-linked, and their claims are kept separate too — the bench enquiries belong to that page, the overhaul-line requirements belong to this one. It is the same no-double-counting rule this whole catalogue follows.

Q · 05 Can the same line handle portable oxygen cylinders?

Yes, and it usually should, because the two items travel together in service and fail on the same neglect. A portable oxygen set is a small high-pressure cylinder, a regulator, a gauge, a hose and a mask in a carry frame, and a fleet that overhauls the masks but not the sets it carries them in has only solved half its problem. What the cylinders add to the flow is pressure work: periodic hydrostatic testing to prove the cylinder still safely holds its rated pressure, valve overhaul with approved components, internal inspection and internal cleanliness to the same oxygen-clean standard, and finally recharge with clean, dry, oil-free oxygen before the set returns to service. That last step connects this facility to the ground charging equipment described on our aircraft oxygen pages — a cylinder line is not much use without a clean way to fill what it has just certified. Sharing one line for both keeps the discipline, the records and the trained people in one place, which is cheaper and safer than running two half-capabilities. It also matches how these requirements actually arrive, since the same programmes ask for mask and portable-cylinder overhaul together.

Q · 06 Has Neometrix delivered an overhaul facility of this class?

Neometrix has quoted against successive aircrew oxygen mask and portable oxygen cylinder repair-and-overhaul setup requirements — the overhaul line and the test facility that certifies it — offered as facility engineering, indigenisation and integration, with the airworthy mask and cylinder components sourced from their approved makers, and no delivered overhaul facility is claimed. We would rather say that plainly than dress it up. The record behind the sentence is a run of pursued requirements to set up exactly this capability: a mask repair-and-overhaul line together with the test facility that proves it, and the same treatment for portable oxygen cylinders — each answered as a facility-engineering and indigenisation offer rather than as a claim to be the mask's maker. Around those bids stands the competence this site shows in depth: the oil-free, oxygen-clean high-pressure-gas engineering behind our aircraft oxygen and charging systems, test-bench and test-facility integration as the house trade, and the calibration-and-records culture that runs through every laboratory we build. The honest shape of a first contract is what these requirements themselves define: engineer the line, install and prove the clean process and the benches, establish the certification process against the customer's approved data, train the technicians, and hand over records that will still make sense in ten years.

Q · 07 Who holds the approvals — you or the customer?

The customer, and the distinction is important enough to state on the page. A repair organisation is approved by its own airworthiness authority to overhaul specific items against specific approved data — the maintenance manual, the component maintenance publication, the build standard and the test schedule for that item. That approval belongs to the operator or the maintenance organisation, not to the company that builds their workshop. What we supply is the facility that makes the approval achievable: a line laid out so that flow and quarantine satisfy an auditor, a clean process that can be validated, benches that measure what the approved data asks for and can be calibrated to prove it, a records system that produces the traceability an approval requires, and training so the technicians work the process as written. In the same way, the airworthy components fitted during rebuild are sourced from their approved makers — we do not manufacture mask parts or claim design authority over the item. So the honest division is: the customer holds the approval and the data, the approved makers supply the parts, and Neometrix engineers and integrates the facility and the process that turn those into certified, serviceable items.

Q · 08 Why set up a local line instead of returning items to their maker?

Because of the clock and the shelf. Returning life-support items to their original maker works, but every item spends months in transit, customs and a queue, and a fleet must hold enough spare masks and sets to cover that entire loop for every aircrew member. That float is expensive, it ages on the shelf, and it grows every time the loop lengthens. A local overhaul line collapses the loop: items are booked in, worked and certified within the fleet's own cycle, so the float shrinks, aircrew are not flying on the last serviceable mask in the store, and a surge in flying does not become a shortage of life-support equipment. There is a second reason, which is why these requirements are usually written as indigenisation: a capability held at home is not exposed to another country's export rules, currency or priorities, and the knowledge of how the item is restored stays inside the organisation that depends on it. The trade-off is real — a local line must earn and keep its approval, its calibration and its discipline, which is work — but for a fleet of any size the arithmetic and the independence both point the same way.

The benches, the system, and the rotary wing.

Three neighbours in the oxygen and overhaul world.

↗ The benches

Aircraft Component Overhaul Test Benches

The test equipment itself — rigs that prove a component against its approved data.

↗ The system

Aircraft Oxygen System

The airborne delivery and the ground charging half — where serviceable masks are proven before flight.

↗ The rotary wing

Helicopter Oxygen System

Cabin, portable and casualty oxygen — the equipment this line keeps serviceable.

Browse all Neometrix product lines.

Get a quotation

Tell us the items, the volumes,
and the approval you must satisfy.

The projects desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — overhaul facility Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — AIRCREW OXYGEN MASK OVERHAUL & TEST FACILITY RECEIVE · STRIP · CLEAN · INSPECT · REBUILD · TEST · CERTIFY — IN UNSERVICEABLE, OUT CERTIFIED ENGINEERED IN NOIDA · INDIA

In unserviceable. Out certified.

Why a mask cannot simply be repaired.

Life-support wears out

An overhaul ends in a signature

Where this sits

Six stations, one direction.

1 · Receive & quarantine

2 · Strip

3 · Clean

4 · Inspect

5 · Repair & rebuild

6 · Test & certify

What the facility contains, element by element.

One discipline, four ways to buy it.

The complete flow

The pressure side

The proving half

Wherever a fleet must keep its own masks flying.

Air force depots

Naval air arms

Indigenisation programmes

MRO organisations

Trainer & transport fleets

Portable oxygen holdings

Common questions.

The benches, the system, and the rotary wing.

Aircraft Component Overhaul Test Benches

Aircraft Oxygen System

Helicopter Oxygen System

Tell us the items, the volumes,
and the approval you must satisfy.

Similar Products

Share This Page

In unserviceable. Out certified.

Why a mask cannot simply be repaired.

Life-support wears out

An overhaul ends in a signature

Where this sits

Six stations, one direction.

1 · Receive & quarantine

2 · Strip

3 · Clean

4 · Inspect

5 · Repair & rebuild

6 · Test & certify

What the facility contains, element by element.

One discipline, four ways to buy it.

The complete flow

The pressure side

The proving half

Wherever a fleet must keep its own masks flying.

Air force depots

Naval air arms

Indigenisation programmes

MRO organisations

Trainer & transport fleets

Portable oxygen holdings

Common questions.

The benches, the system, and the rotary wing.

Aircraft Component Overhaul Test Benches

Aircraft Oxygen System

Helicopter Oxygen System

Tell us the items, the volumes,and the approval you must satisfy.

Similar Products

Share This Page

Tell us the items, the volumes,
and the approval you must satisfy.