Who manufactures the Altitude Switch Test Rig?

The Altitude Switch Test Rig is designed and manufactured by Neometrix Engineering Pvt Ltd, a leading defence and aerospace test equipment manufacturer based in Noida, India.

What electrical supply does the rig need?

The rig requires 230 V ±10%, single-phase, 50 Hz AC. The integrated DC power supply provides 0–32 V DC at up to 2 A for the test circuit.

Is the rig MIL-standard compliant?

Yes. The rig uses MIL-grade components including the MIL D 38999/26 FA 35 SN mating plug and shielded PTFE wiring, and is designed to comply with MIL-STD requirements for the IJT-LSP project.

NMX‑AST‑7600 / Rev 01 / IJT‑LSP · Altitude Switch · 7600 m / MIL‑Grade · Aviation Noida · India · 2026

NMX-AST-7600

Altitude switch test rig. 7600 m.

Aviation test rig for evaluating the performance, accuracy, and durability of the altitude switch used in the IJT‑LSP (Intermediate Jet Trainer – Limited Series Production) project — MIL-grade construction, real-time LED indication, calibrated instruments with traceability certificates.

Request proposal UUT overview

Altitude Switch Test Rig — Neometrix, Noida

Fig · 01 Front panel — DC supply, insulation tester, ammeter, indicator lamps

Altitude Threshold

7600m

Tolerance

±150m

DC Output

32V DC

Insulation Test

1KV DC

Standard

MIL-grade

Overview

Precision altitude switch validation.

The Altitude Switch Test Rig evaluates the altitude switch — a critical avionic component that activates or deactivates an electrical circuit based on atmospheric pressure — at its design threshold of 7600 m (±150 m).

Altitude Switch Test Rig — instrument panel

Fig · 02 Instrument panel — toggle switches, LED lamps, ammeter

The rig is purpose-built to support the IJT-LSP (Intermediate Jet Trainer – Limited Series Production) Project, providing a complete electrical and pneumatic test environment for the altitude switch. It validates switch activation pressure, insulation integrity, and circuit continuity in a single integrated bench.

The altitude switch functions on a bellow-and-micro-switch principle: atmospheric pressure change causes the bellow assembly to expand, deflecting the adjusting cap nut until the normally-open micro switch closes and completes the electrical circuit. The rig replicates this stimulus precisely and measures the switch-over point.

Altitude threshold verification, insulation test, and circuit continuity — one bench, three checks, all MIL-grade.

Real-time feedback is provided via front-panel green and red LED indicator lamps (28 V DC) and a calibrated 3½-digit ammeter monitoring the switched circuit. All instruments are supplied with test and calibration certificates.

Unit Under Test

The altitude switch anatomy.

The UUT — the altitude switch — is a five-component assembly whose operating principle determines how the rig is configured and how test results are interpreted.

Component · 01

Pipe Union

Connects the altitude switch to the pneumatic test circuit. Serves as the pressure inlet point for applying the simulated atmospheric pressure stimulus to the bellow assembly.

Pneumatic Interface · Pressure Inlet

Component · 02

Bellow Assembly

Expands or contracts in response to pressure variations. Converts the absolute pressure signal into mechanical displacement that drives the micro switch actuation mechanism.

Pressure-to-Motion Transducer

Component · 03

Adjusting Cap Nut

Regulates bellow assembly travel to set the precise activation threshold corresponding to 7600 m altitude pressure. Factory-calibrated at manufacture.

Threshold Setting · Factory Calibrated

Component · 04

Micro Switch (N/O)

Normally-open switch that closes when bellow displacement reaches the threshold corresponding to pressure below 7600 m (±150 m), completing the aircraft electrical circuit.

N/O · Activates below 7600 m

Component · 05

Electrical Connector

MIL-grade interface (mating plug: MIL D 38999/26 FA 35 SN) for aircraft harness connection. The rig uses a matched mating plug for standardised electrical interfacing during test.

MIL D 38999/26 FA 35 SN · Shielded PTFE

Operating Principle

Test Sequence

1. Pressure applied to pipe union.
2. Bellow assembly expands.
3. Micro switch closes below 7600 m equivalent.
4. LED indicator illuminates & ammeter confirms current.

Pneumatic → Mechanical → Electrical

Key Features

What the rig delivers.

Four core capabilities that make this rig suitable for defence aviation test programmes.

Feature · 01

Accurate Altitude Threshold Sensing

Tests the altitude switch at its precise design activation pressure — equivalent to 7600 m ±150 m. Calibrated instruments ensure the switch-over point is measured with traceable accuracy.

Feature · 02

Aircraft Safety Enhancement

Validates that the altitude switch will perform reliably in service. Catches defective switches before aircraft integration, preventing electrical failures in altitude-dependent systems.

Feature · 03

Leak-Proof Pressure Verification

Confirms zero pressure loss at the test pressure level, verifying bellow assembly and pipe union sealing integrity. Essential for confirming the switch will hold calibration in service.

Feature · 04

Real-Time Monitoring

Front-panel green/red LED indicators (28 V DC) and calibrated DPI switch provide instant visual confirmation. 3½-digit ammeter displays switched circuit current in real time.

Specifications

Full instrument complement.

All instruments are supplied with individual test and calibration certificates. MIL-grade wiring and connectors throughout.

System Reference	Altitude Switch Test Rig · NMX-AST-7600
DC Power Supply	Input: 230 V ±10%, 1-Phase, 50 Hz AC · Output: 0–32 V DC, 2 A rated · 3½-digit display · Calibration certificate supplied
Insulation Tester	Range: 0–20 GΩ · Test voltages: 500 V DC & 1000 V DC · Calibration certificate supplied
Ammeter	Range: 0–2 A · Accuracy: 0.1% · 3½-digit with external shunt · Calibration certificate supplied
Mating Plug	MIL D 38999/26 FA 35 SN
Toggle Switches	DPST & SPST types
Indicator Lamps	Green (28 V DC) · Red (28 V DC)
Wiring	Shielded PTFE wire · Ferrule and thimble terminations
Potentiometer	0–270 Ω · 10 W rated
UUT Altitude Threshold	7600 m ±150 m
UUT Switch Type	Normally Open (N/O) micro switch — closes at threshold
Application	IJT-LSP Project — Indian Air Force Intermediate Jet Trainer

Applications

Where it matters.

Defence aviation, aerospace R&D, and avionics quality assurance wherever altitude-dependent switching components must be validated before aircraft integration.

A · 01Aviation & Aerospace — ensures altitude switches function reliably at design pressure thresholds

A · 02Defence & Military — qualification testing for IJT-LSP and other military aircraft programmes

A · 03Flight Safety Systems — verifies altitude-dependent switching mechanisms in avionic circuits

A · 04Production QC — end-of-line testing of altitude switches before aircraft integration

A · 05R&D Laboratories — validation of new altitude switch designs at operating pressure

A · 06MRO & Overhaul — recertification of repaired or overhauled altitude switches post-maintenance

In Depth

The complete technical read.

Engineering narrative for test engineers and procurement teams specifying altitude switch test equipment for defence aviation programmes.

The altitude switch in IJT-LSP

The altitude switch is a safety-critical avionic component that monitors ambient pressure and provides an electrical signal when atmospheric pressure corresponds to altitudes below 7600 m ±150 m. This signal drives warning systems or activates protective circuits in the IJT aircraft.

Because the switch operates on absolute atmospheric pressure rather than gauge pressure, it must be tested under controlled low-pressure conditions that replicate the atmosphere at 7600 m. The Altitude Switch Test Rig provides this environment with precision and traceability.

Test methodology

Electrical setup

The altitude switch is connected via the MIL D 38999/26 FA 35 SN mating plug. The DC power supply is set to the required voltage and the insulation tester verifies dielectric integrity before pressurisation.

Pneumatic pressurisation & threshold verification

Pressure is applied to the switch pipe union. The bellow expands until the micro switch closes — confirmed by the green LED lamp illuminating and a current reading on the ammeter. The switch-over pressure is compared against the 7600 m ±150 m specification for pass/fail determination.

MIL-grade construction

Shielded PTFE wiring throughout, ferrule and thimble terminations at all connection points, and the matched MIL D 38999/26 FA 35 SN mating plug. All three primary instruments are supplied with individually traceable calibration certificates satisfying defence procurement quality plan requirements.

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01What altitude threshold does the rig test?

The rig tests the altitude switch activation point at 7600 m ±150 m — the atmospheric pressure at which the bellow deflects sufficiently to close the normally-open micro switch and complete the aircraft electrical circuit.

Q · 02What electrical supply is needed?

230 V ±10%, single-phase, 50 Hz AC. The integrated DC power supply then provides 0–32 V DC at up to 2 A for the test circuit.

Q · 03Are the instruments calibrated and certified?

Yes. DC power supply, insulation tester, and ammeter are each supplied with individual test and calibration certificates traceable to national standards, meeting defence quality plan traceability requirements.

Q · 04Which mating connector does the rig use?

MIL D 38999/26 FA 35 SN — the correct series for the IJT-LSP altitude switch connector. Shielded PTFE wiring and ferrule/thimble terminations throughout.

Q · 05Can the rig be adapted for other altitude thresholds?

Yes. Neometrix can configure the rig for different altitude thresholds, connector types, and switch specifications. Contact us with the UUT part number and test requirement for a feasibility review.

Q · 06What after-sales support is available?

Installation, commissioning, operator training, preventive maintenance, and on-site service. Standard 12-month warranty on manufacturing defects. Annual maintenance contracts available post-warranty.

Downloads

Technical documents.

Product catalogue and engineering design documents for the NMX-AST-7600.

PDF · Catalogue

Product Datasheet & Catalogue

Altitude Switch Test Rig →

PDF · Engineering Drawing

Engineering Design Document 1

GA Drawing & Circuit Schematic →

PDF · Engineering Drawing

Engineering Design Document 2

Wiring Diagram & BOM →

PDF · Engineering Drawing

Engineering Design Document 3

Test Procedure & Calibration Record →

Presentation

Product overview deck.

Seven-slide summary of the NMX-AST-7600 — design, UUT anatomy, specifications, and applications.

NMX‑AST‑7600 · Rev 01

Altitude Switch
Test Rig

IJT‑LSP · 7600 m Altitude Threshold · MIL‑Grade

Neometrix Engineering Pvt Ltd · Noida, India

02 / 07

What is it?

A specialized test rig for evaluating the altitude switch used in the IJT‑LSP (Intermediate Jet Trainer – Limited Series Production) project — a safety-critical aviation component that activates aircraft circuits based on atmospheric pressure.

What it tests

Altitude switch activation at 7600 m pressure equivalent

Why it matters

Safety-critical switch activates/deactivates aircraft electrical circuits based on altitude — must be verified before integration

What it delivers

Threshold verification + insulation test + circuit continuity in one bench

03 / 07

Unit Under Test — Altitude Switch Components

Pipe UnionPressure inlet — connects switch to pneumatic test circuit

Bellow AssemblyExpands with pressure — converts pressure to mechanical displacement

Adjusting Cap NutSets activation threshold — factory-calibrated to 7600 m

Micro Switch (N/O)Closes below 7600 m equivalent — sends aircraft electrical signal

Electrical ConnectorMIL D 38999/26 FA 35 SN — aircraft harness interface

04 / 07

Operating Principle

Pressure applied to the altitude switch pipe union through the rig pneumatic circuit

→

Bellow assembly expands in response to changing absolute pressure

→

Micro switch closes when pressure corresponds to altitude below 7600 m ± 150 m

→

Rig confirms via green LED lamp and digital ammeter current reading

Pneumatic → Mechanical → Electrical — validated in one cycle.

05 / 07

Key Specifications

7600m

Altitude Threshold

±150m

Tolerance

32V DC

DC Supply Output

1000V DC

Insulation Test Voltage

20GΩ

Insulation Range

Ammeter Range

All instruments with calibration certificates · Mating plug: MIL D 38999/26 FA 35 SN · Shielded PTFE wiring

06 / 07

Features

Accurate altitude threshold sensing at 7600 m ±150 m
Insulation test up to 1000 V DC / 20 GΩ
Real-time LED indication (green/red, 28 V DC)
Calibrated 3½-digit ammeter with external shunt
MIL-grade PTFE wiring & MIL-D 38999 connector
Traceable calibration certificates for all instruments

Applications

IJT‑LSP altitude switch qualification testing
Aviation & aerospace production QC
Defence & military aircraft programmes
Flight safety system validation
MRO & overhaul recertification
R&D prototype validation

07 / 07

Ready to specify?

Tell us your UUT part number, altitude threshold, and test programme. We configure the rig and walk through the test procedure before you commit.

Request proposal → +91 7777 876 876

Neometrix Engineering Pvt Ltd · Noida, India · neometrixgroup.com

1 / 7

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We review the altitude switch specification, configure the rig, and walk through the test procedure with your engineering team before you commit.

Request proposal +91 7777 876 876

Altitude switch test rig. 7600 m.

Precision altitude switch validation.

The altitude switch anatomy.

Pipe Union

Bellow Assembly

Adjusting Cap Nut

Micro Switch (N/O)

Electrical Connector

Test Sequence

What the rig delivers.

Accurate Altitude Threshold Sensing

Aircraft Safety Enhancement

Leak-Proof Pressure Verification

Real-Time Monitoring

Full instrument complement.

Where it matters.

The complete technical read.

The altitude switch in IJT-LSP

Test methodology

Electrical setup

Pneumatic pressurisation & threshold verification

MIL-grade construction

Common questions.

Technical documents.

Product overview deck.

Altitude SwitchTest Rig

What is it?

Unit Under Test — Altitude Switch Components

Operating Principle

Key Specifications

Features

Applications

Ready to specify?

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