ERU119 · ERU120 Hook Proving / Ejection Release Unit Test Rig / MIL‑STD · ISO · IS Compliant / Noida · India

ERU119 · ERU120 HOOK PROVING RIG

Lock Loading Test Rig, proving ejection-release hooks to 63,000 lbf.

A self-contained test bench that hook-proves Ejection Release Units (ERU119 & ERU120) under sequential, horizontally-applied load. Custom pin-jointed fixtures protect the unit under test while LVDT displacement sensing and in-situ calibrated load cells drive an automatic OK/NG deformation verdict against pre-fed limits.

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Lock Loading Test Rig CAD render — hook-proving load test bench for ERU119 and ERU120 Ejection Release Units by Neometrix

Fig · 01 Render · Lock Loading Test Rig frame, loading rams and fixture stations

Qualification testing supported to:

DEF STAN STANAG MIL-SPEC

Units Tested

ERU119 & 120

Peak Hook Load

63,000LBF

Displacement Sensing

LVDTMAGNETIC

Calibration

IN‑SITUAUTO

Test Verdict

OK/NGAUTO

Overview

Hook load proving, without guesswork.

Ejection Release Units carry the load path between an aircraft and the stores it releases. Before an ERU119 or ERU120 is cleared for service, its hooks have to be proven under controlled, repeatable load — not estimated.

Lock Loading Test Rig isometric render showing dual-station bench frame for ERU119 and ERU120 by Neometrix

Fig · 02 Render · dual-station bench frame with fixture mounts

The Lock Loading Test Rig is a self-contained bench built to test both Ejection Release Unit types for Hook Proving Loads and load deformation. Each unit type — ERU119 and ERU120 — has an independent test bench, so a unit is never damaged by a fixture built for the other type's hook profile.

Loading is applied horizontally and sequentially through a custom-made fixture that is matched to the unit's own profile. Displacement is tracked by an LVDT with magnetic contact, while load cells on both benches carry an automatic in-situ calibration facility, so the rig re-verifies its own accuracy without being pulled off the floor for external calibration.

The result comes back as OK/NG — automatically — against pre-fed deformation and load settings.

Load per hook and ultimate load across both hooks are pre-programmed for each configuration, and the pin-jointed loading structure ensures the load is applied evenly across both hooks of the unit under test.

System Architecture

Two benches, one loading logic.

The mechanical system and the sequential loading logic are engineered together, so both ERU120 hook configurations and the ERU119 hook are proven under the same disciplined test sequence.

Sub · 01

Independent Test Benches

Separate, self-contained benches for ERU119 and ERU120 with horizontal loading facility, so unit profiles are never cross-fitted.

Sub · 02

Custom Fixture

Purpose-made fixture holds the unit and accommodates its exact profile, so the unit under test is never damaged during loading.

Sub · 03

LVDT Displacement Sensing

LVDT with magnetic contact tracks hook displacement through the loading cycle for real-time deformation measurement.

Sub · 04

In-Situ Calibrated Load Cells

Both systems carry load cells with in-situ calibration; calibration runs automatically without external instrumentation.

Sub · 05

Sequential Loading

Load is applied to the unit sequentially, following pre-set per-hook and ultimate-load values for each ERU configuration.

Sub · 06

Pin-Jointed Load Path

The mechanical fixture's pin-jointed structure applies load evenly across both hooks of the unit under every configuration.

Loading System

Pre-set loads, per configuration.

Per-hook and ultimate load values are pre-programmed for each ERU hook configuration and applied sequentially through the loading cycle.

ERU120 · 14″ Hooks	Load per hook: 31,500 lbf · Ultimate load (both hooks): 63,000 lbf, evenly applied through pin-jointed structure
ERU120 · 30″ Hooks	Load per hook: 77,700 lbf · Ultimate load (both hooks): 38,850 lbf, per pre-fed test configuration
ERU119	Load per hook: 34,600 lbf · Ultimate load (both hooks): 17,300 lbf, evenly applied through pin-jointed structure
Loading Sequence	Sequential application per unit; both ERU120 and ERU119 conditions run to their own pre-fed schedule
Verdict Logic	Automatic OK/NG on the basis of pre-fed deformation & load settings in the system

Key Features

Built for the test floor.

A compact, self-contained rig designed around ease of operation and repeatable results.

Ease of operation: sequential loading and automatic OK/NG verdicts remove operator judgement calls from the pass/fail decision.
User friendliness: independent benches and custom fixtures make unit changeover fast and mistake-resistant.

Compact structure: a self-contained footprint that tests both ERU119 and ERU120 without additional floor-mounted equipment.
Approved instrumentation: measuring instruments on the rig are approved by the competent calibration authority.

Gallery

The rig, from every angle.

CAD renders and FEA deformation studies of the Lock Loading Test Rig frame and loading structure. Click any image to enlarge.

Lock Loading Test Rig — isometric CAD render, view 1

Lock Loading Test Rig — FEA total deformation study, view 2

Lock Loading Test Rig — FEA structural stress study, view 3

Lock Loading Test Rig — FEA structural stress study, view 4

Fig · 03–06 Renders · bench frame, loading structure and FEA deformation/stress studies used in design validation

Downloads

Catalog & design drawing.

Product catalog and Design-1 engineering drawing, available as PDF for procurement and technical review.

Catalog

Lock Loading Test Rig — Product Catalog

PDF

Drawing · Design 1

Lock Loading Test Rig — Design Drawing 1

PDF

Specifications

Full technical parameters.

Key parameters for the standard Lock Loading Test Rig configuration testing ERU119 and ERU120.

Units Under Test	Ejection Release Units ERU119 & ERU120
Test Purpose	Hook Proving Load and load deformation testing
Test Benches	Independent, self-contained bench per unit type
Loading Facility	Horizontal, sequential loading
Fixture	Custom-made per unit profile; non-damaging clamping
Displacement Measurement	LVDT with magnetic contact
Load Measurement	Load cells with automatic in-situ calibration
ERU120 · 14″ Hooks	31,500 lbf/hook · 63,000 lbf ultimate (both hooks)
ERU120 · 30″ Hooks	77,700 lbf/hook · 38,850 lbf ultimate (both hooks)
ERU119	34,600 lbf/hook · 17,300 lbf ultimate (both hooks)
Load Application	Pin-jointed structure; evenly applied across both hooks
Result Output	Automatic OK/NG against pre-fed deformation & load settings
Reference Standards	MIL-STD, ISO, IS and customer-specified requirements

Applications

Where it's put to work.

Wherever an ejection release or lock mechanism has to be proven before it's cleared for service.

A · 01ERU119 / ERU120 hook proving — qualification and acceptance testing of ejection release units

A · 02Aircraft stores-release system testing — validating lock and release mechanisms before fleet clearance

A · 03Depot-level overhaul & MRO — re-proving ERUs after maintenance or repair

A · 04Defence quality assurance labs — batch acceptance testing to MIL-STD / IS / ISO requirements

A · 05Aerospace component manufacturers — production-line load proving of hook and lock hardware

A · 06Design validation — correlating FEA deformation studies against physical load test data

In Depth

The complete technical read.

Engineering narrative for defence procurement teams, MRO planners, and quality assurance officers evaluating the Lock Loading Test Rig before acquisition.

1. Introduction

The Lock Loading Test Rig is a precision test bench designed for hook proving load and load-deformation testing of Ejection Release Units ERU119 and ERU120. These units carry the physical hook interface between an aircraft and the stores it is required to release, so their hooks must be proven under repeatable, controlled load before the unit is cleared for service. A self-contained test bench is provided to test both unit types, and the test outcome is reported automatically as OK/NG on the basis of pre-fed deformation and load settings in the system.

2. Mechanical system

Independent benches: a separate bench is provided for ERU119 and for ERU120, each with a horizontal loading facility.
Custom fixture: a purpose-made fixture holds each unit, accommodating its profile so the unit is not damaged during testing.
LVDT displacement sensing: an LVDT with magnetic contact is provided for displacement measurement through the loading cycle.
In-situ calibrated load cells: both systems have load cells with an in-situ calibration facility; calibration runs automatically.

3. Loading system

Loading of the unit is applied sequentially. For both ERU120 and ERU119 the loading condition follows a pre-set schedule per hook configuration:

Configuration	Load per Hook	Ultimate Load (Both Hooks)
ERU120 · 14″ hooks	31,500 lbf	63,000 lbf
ERU120 · 30″ hooks	77,700 lbf	38,850 lbf
ERU119	34,600 lbf	17,300 lbf

In every configuration, the mechanical fixture's pin-jointed structure is designed so the load is applied evenly across both hooks of the unit under test, rather than concentrating it on a single hook.

4. Key features

Ease of operation: sequential loading and automatic OK/NG scoring simplify the operator's role in each test cycle.
User friendliness: independent benches and unit-matched fixtures keep changeover between ERU types fast.
Compact structure: a self-contained footprint tests both unit types without additional floor-mounted equipment.
Approved instrumentation: the entire instrument and measuring instrumentation are approved by the competent authority.

5. Applications

Ejection release unit qualification: hook-proving and acceptance testing of ERU119 and ERU120 units.
Stores-release system validation: proving aircraft lock and release mechanisms before fleet clearance.
MRO and depot overhaul: re-proving units after maintenance, repair, or overhaul cycles.
Defence QA and production testing: batch acceptance to MIL-STD, IS, and ISO requirements, and production-line load proving for aerospace component manufacturers.

Technical specifications at a glance

Units Under Test	ERU119 & ERU120
Test Type	Hook Proving Load / load deformation
Displacement Sensing	LVDT with magnetic contact
Load Calibration	In-situ, automatic
Result Output	Automatic OK/NG
Standards	MIL-STD · ISO · IS · customer-specified

Conclusion

Neometrix's Lock Loading Test Rig delivers a compact, self-contained, and repeatable hook-proving solution for ERU119 and ERU120 Ejection Release Units. By combining independent unit-specific benches, in-situ calibrated load cells, and automated OK/NG deformation scoring, the rig removes operator judgement from the pass/fail decision and gives defence and aerospace customers a traceable basis for clearing lock mechanisms into service.

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 What is the Lock Loading Test Rig?

The Lock Loading Test Rig is a precision-engineered hook-proving load test bench designed and manufactured by Neometrix Engineering Pvt Ltd, India. It tests Ejection Release Units (ERU119 & ERU120) for Hook Proving Loads and load deformation, with test results automatically reported as OK/NG against pre-fed deformation and load settings.

Q · 02 Who manufactures the Lock Loading Test Rig?

The Lock Loading Test Rig is designed and manufactured by Neometrix Engineering Pvt Ltd, a leading test equipment manufacturer based in India.

Q · 03 What industries use the Lock Loading Test Rig?

The Lock Loading Test Rig is used across defence, aerospace, automotive, railways, and industrial sectors for precision hook and lock-mechanism load testing and performance validation.

Q · 04 Is the Lock Loading Test Rig customizable?

Yes, Neometrix offers customized versions of the Lock Loading Test Rig tailored to specific client requirements, operational parameters, and industry standards.

Q · 05 Does the Lock Loading Test Rig comply with relevant standards?

Yes, the Lock Loading Test Rig is designed to comply with applicable national and international standards including MIL-STD, ISO, IS, and customer-specified requirements.

Q · 06 What are the key features of the Lock Loading Test Rig?

Key features include independent test benches for ERU119 and ERU120, horizontal sequential loading, custom fixtures that protect the unit under test, LVDT displacement measurement with magnetic contact, and load cells with automatic in-situ calibration.

Q · 07 Can the Lock Loading Test Rig be integrated with data acquisition systems?

Yes, the Lock Loading Test Rig can be integrated with advanced DAQ systems for real-time monitoring, automated OK/NG reporting, and traceability of test results.

Q · 08 What after-sales support does Neometrix provide for the Lock Loading Test Rig?

Neometrix provides comprehensive after-sales support including installation, commissioning, operator training, preventive maintenance, and on-site service for the Lock Loading Test Rig.

Q · 09 How can I get a quotation for the Lock Loading Test Rig?

You can request a quotation for the Lock Loading Test Rig by contacting Neometrix Engineering Pvt Ltd through the contact form on this page or by reaching out via email or phone.

Q · 10 Does Neometrix export the Lock Loading Test Rig internationally?

Yes, Neometrix Engineering Pvt Ltd exports the Lock Loading Test Rig to global customers in defence, aerospace, and industrial sectors across multiple countries.

Get a proposal

Tell us your ERU type
and test requirements.

We size the fixture and loading schedule to your ERU configuration, and walk through commissioning, calibration, and operator training with your QA team.

Request proposal +91 7777 876 876

Lock Loading Test Rig, proving ejection-release hooks to 63,000 lbf.

Hook load proving, without guesswork.