What after-sales support does Neometrix provide?

Neometrix provides comprehensive after-sales support including installation, commissioning, operator training, preventive maintenance, and on-site service for the Test Equipment for Aircraft Fuel Pump.

NR-31BT1 Preliminary Regulation Rig / Model A4135 · Supplied to HAL / MIL-STD · ISO · IS / Noida · India

MODEL A4135 · ATF HYDRAULIC RIG

Test Equipment for Aircraft Fuel Pump, built for NR-31BT1 preliminary regulation.

Model A4135 is a precision hydraulic rig for the preliminary regulation and calibration of the NR-31BT1 aircraft-engine fuel pump and fuel-control unit — the assembly that governs fuel flow against throttle position, engine speed, inlet air temperature, compressor outlet pressure, and compressor inlet guide-vane position. ATF working media, PLC/HMI control, and a 10-point pressure-gauge readout panel for repeatable pre-installation setup.

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Test Equipment for Aircraft Fuel Pump - NR-31BT1 preliminary regulation pressure gauge readout panel, Neometrix rig supplied to HAL

Fig · 01 Photograph · 10-point pressure-gauge test panel, Model A4135, supplied to HAL

Engineered and qualification-tested to:

MIL-STD DEF STAN STANAG

Model

A4135

ATF Tank Capacity

100LITRE

Test Pressure

10KGF/CM²

Filter Rating

16MICRON

Fluid Temp Range

15–40°C

Overview

Preliminary regulation, done before the unit ever sees an engine.

The NR-31BT1 is the fuel pump and controller of the aircraft engine — the component that decides how much fuel reaches the combustor at every instant of flight. Getting its regulation wrong before installation is not an option, so Neometrix built Model A4135 to set it up right, on the bench, under controlled hydraulic conditions.

PLC control cabinet with status indicator lamps on Neometrix Test Equipment for Aircraft Fuel Pump hydraulic rig

Fig · 02 Photograph · PLC control cabinet with status indicator lamps

This test equipment is meant for the preliminary regulation of the Aircraft Fuel Pump test rig unit — the NR-31BT1. It regulates fuel flow in relation to throttle position, engine speed, engine inlet air temperature, engine compressor outlet pressure, and electrical commands for engine control. Beyond fuel flow, the NR-31BT1 unit also controls the position of the compressor inlet guide vanes in relation to engine speed and engine inlet temperature.

One rig, one working fluid, one repeatable pre-installation regulation procedure — before the unit goes anywhere near an airframe.

ATF (Aviation Turbine Fuel) is used as the working media throughout, matching the fluid the NR-31BT1 will see in service. A PLC/HMI-based control cabinet drives the test sequence while a 10-point analogue pressure-gauge panel gives technicians a direct, at-a-glance readout across every monitored line — the same rig configuration supplied to Hindustan Aeronautics Limited (HAL).

Regulated Parameters

What the NR-31BT1 actually controls.

Two coupled control functions, both set up and verified on the A4135 rig before the unit is cleared for engine fit.

FUNCTION · 01

Fuel Flow Regulation

Fuel delivery is metered against throttle position, engine speed, engine inlet air temperature, engine compressor outlet pressure, and electrical commands from engine control — the core governing function of the NR-31BT1.

Primary Control Loop

FUNCTION · 02

Compressor Inlet Guide Vane Position

The unit also positions the compressor inlet guide vanes relative to engine speed and inlet air temperature — optimizing airflow into the engine for efficiency and stability across the flight envelope.

Secondary Control Loop

System Components

Every station on the A4135 bench.

From the ATF pump set to the PLC control cabinet, each station is built around a single, jointly commissioned test sequence.

Sub · 01

ATF Hydraulic Power Pack

Flameproof-motor-driven pump set with a 100-litre ATF service tank, feeding the NR-31BT1 unit under test at controlled pressure and flow.

Sub · 02

Ball Valve, Filter & NRV Train

Ball valve and non-return valve rated to 10 kgf/cm², with a 16-micron in-line filter protecting the NR-31BT1's fine internal clearances.

Sub · 03

10-Point Pressure Gauge Panel

Analogue test gauges across ten monitored lines give technicians a direct, simultaneous readout of every regulated pressure point.

Sub · 04

PLC / HMI Control Cabinet

Touchscreen HMI, indicator lamps, and process interlocks sequence the preliminary regulation run and log test parameters.

Key Features

Set the unit up right, once.

Preliminary regulation on the A4135 catches setup errors before the NR-31BT1 is ever installed on an engine.

Fuel flow regulation: preliminary regulation of the NR-31BT1's fuel control system, ensuring fuel is delivered per throttle position, engine speed, and inlet-air-temperature parameters.
Engine performance optimization: fine-tunes fuel flow against compressor outlet pressure and electrical commands, so the unit maintains optimal engine response once installed.

Compressor inlet guide vane control: regulates the NR-31BT1's control over compressor inlet guide vanes, optimizing airflow for efficiency and stability across operating conditions.
Preliminary calibration and adjustment: lets technicians align the unit to expected engine performance specifications before full engine testing, reducing downstream performance issues.

Gallery

The rig, station by station.

Nine photographs of the A4135 bench — ATF power pack, NR-31BT1 unit under test, pressure-gauge panel, and PLC/HMI control cabinets.

Test Equipment for Aircraft Fuel Pump - 10-point pressure gauge test panel

Test Equipment for Aircraft Fuel Pump - PLC control cabinet with status indicator lamps

Test Equipment for Aircraft Fuel Pump - Siemens HMI touchscreen and control panel

Downloads

Catalog & design documents.

Product catalog and engineering design document, available as PDF for procurement and technical review.

Catalog

Test Equipment for Aircraft Fuel Pump — Product Catalog

PDF

Drawing · Design

Test Equipment for Aircraft Fuel Pump — Engineering Design Document

PDF

Specifications

Full technical parameters.

Key parameters for the standard Model A4135 Test Equipment for Aircraft Fuel Pump configuration.

Model	A4135
Unit Under Test	NR-31BT1 aircraft engine fuel pump / fuel-control unit
Working Media	ATF (Aviation Turbine Fuel)
Fluid Density (at 15°C)	775.0 to 840.0 kg/m³
Kinematic Viscosity	At minus 20°C, mm²/s
Flash Point	38°C
Working Fluid Temperature	15 to 40°C
ATF Tank Capacity	100 litres
Ball Valve Pressure	Up to 10 kgf/cm²
Filter Rating	16 micron
Non-Return Valve	10 kgf/cm²
Pump Pressure	10 kgf/cm²
Motor to Drive Pump	Flameproof type, suitable for aviation fuel service
Control	PLC / HMI touchscreen with 10-point pressure-gauge readout panel
Reference Standards	MIL-STD · ISO · IS · customer-specified requirements

Applications

Where preliminary regulation matters most.

Purpose-built to facilitate the setup and calibration of the Aircraft Fuel Pump before it reaches the engine.

A · 01Pre-installation calibration of NR-31BT1 fuel pump/controller units before engine fit

A · 02Aircraft engine MRO and overhaul depots — incoming/outgoing unit verification

A · 03OEM production-line testing of newly manufactured fuel-control units

A · 04Defence aerospace depots (including HAL) — fleet-support regulation and recalibration

A · 05Compressor inlet guide vane control verification prior to engine ground runs

A · 06Fuel flow response validation against throttle, speed and temperature parameters

Video

See the rig in operation.

A short walkthrough of the Test Equipment for Aircraft Fuel Pump on test.

In Depth

The complete technical read.

Engineering narrative for MRO planners, procurement teams, and quality engineers evaluating the A4135 before commissioning.

1. Introduction

The Test Equipment for Aircraft Fuel Pump, Model A4135, is meant for the preliminary regulation of the Aircraft Fuel Pump test rig unit — the NR-31BT1, which is the fuel pump and controller of the engine. It regulates fuel flow in relation to throttle position, engine speed, engine inlet air temperature, engine compressor outlet pressure, and electrical commands for engine control. Apart from controlling fuel flow, the NR-31BT1 unit also controls the position of the compressor inlet guide vanes in relation to engine speed and engine inlet temperature.

2. Applications

The Test Equipment for Aircraft Fuel Pump is specifically designed to facilitate the setup and calibration of the Aircraft Fuel Pump. It is used across OEM production lines, MRO/overhaul depots, and defence aerospace organizations — the configuration shown here was supplied to Hindustan Aeronautics Limited (HAL) — for pre-installation regulation of fuel pump/controller units before they are fitted to an engine.

3. Key features

Fuel flow regulation: preliminary regulation of the NR-31BT1 unit's fuel control system against throttle position, engine speed, and inlet-air-temperature parameters.
Engine performance optimization: fine-tunes fuel flow in relation to compressor outlet pressure and electrical commands, ensuring the unit maintains optimal engine performance and responsiveness.
Compressor inlet guide vane control: regulates the NR-31BT1's control over compressor inlet guide vanes, optimizing airflow into the engine based on engine speed and inlet temperature.
Preliminary calibration and adjustment: allows technicians to conduct initial adjustments aligning the unit to expected engine performance specifications before full engine testing, reducing potential performance issues after installation.

4. Working fluid specification

ATF is used as the working media for the Test Equipment for Preliminary Regulation of NR-31BT1.

Fluid specifications: density (at 15°C) 775.0 to 840.0 kg/m³; kinematic viscosity at minus 20°C, mm²/s; flash point 38°C; working-fluid temperature 15 to 40°C; ATF tank capacity 100 litres.
Ball valve: pressure up to 10 kgf/cm².
Filter: filter rating 16 micron.
Non-return valve: 10 kgf/cm².
Pump pressure: 10 kgf/cm².
Motor to drive pump: motor suitable to drive the pump, flameproof type.

5. Control & instrumentation

A PLC/HMI-based control cabinet sequences the test run, with a touchscreen interface, indicator lamps, and process interlocks. A 10-point analogue pressure-gauge panel gives technicians a direct, simultaneous readout across every monitored line for immediate, repeatable verification of the NR-31BT1's regulated outputs.

Technical specifications at a glance

Model	A4135
Unit Under Test	NR-31BT1
Working Media	ATF, density 775–840 kg/m³, flash point 38°C
ATF Tank Capacity	100 litres
Rated Pressures	Ball valve / NRV / pump — 10 kgf/cm²
Filter Rating	16 micron
Standards	MIL-STD · ISO · IS

Conclusion

Neometrix's Test Equipment for Aircraft Fuel Pump delivers a compact, precisely instrumented hydraulic rig for preliminary regulation of the NR-31BT1 fuel pump/controller. By combining ATF-matched working conditions with a PLC/HMI-controlled test sequence and a full pressure-gauge readout, the A4135 ensures fuel-control units are correctly set up before they ever reach an aircraft engine.

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 What is the Test Equipment for Aircraft Fuel Pump (Model A4135)?

The Test Equipment for Aircraft Fuel Pump, Model A4135, is a precision hydraulic rig used for the preliminary regulation and calibration of the NR-31BT1 aircraft-engine fuel pump and fuel-control unit. It is designed and manufactured by Neometrix Engineering Pvt Ltd, India.

Q · 02 What is the NR-31BT1 unit that this rig tests?

The NR-31BT1 is the fuel pump and controller of the aircraft engine. It regulates fuel flow in relation to throttle position, engine speed, engine inlet air temperature, engine compressor outlet pressure, and electrical commands, and also positions the compressor inlet guide vanes relative to engine speed and inlet temperature.

Q · 03 What working fluid does the test equipment use?

ATF (Aviation Turbine Fuel) is used as the working media. Fluid specifications include density of 775.0 to 840.0 kg/m³ at 15°C, a flash point of 38°C, a working-fluid temperature range of 15–40°C, and a 100-litre ATF tank capacity.

Q · 04 What are the pressure and filtration ratings of the rig?

The ball valve, pump, and non-return valve are each rated up to 10 kgf/cm², and the in-line filter has a 16-micron rating. The motor driving the pump is a flameproof type, suitable for use with aviation fuel.

Q · 05 Who manufactures the Test Equipment for Aircraft Fuel Pump?

The Test Equipment for Aircraft Fuel Pump is designed and manufactured by Neometrix Engineering Pvt Ltd, a leading test equipment manufacturer based in Noida, India, with deployments including Hindustan Aeronautics Limited (HAL).

Q · 06 What industries and organizations use this test equipment?

This test equipment is used by aircraft engine OEMs, overhaul depots, and defence aerospace organizations such as HAL for preliminary regulation and calibration of fuel pump/controller units prior to engine installation.

Q · 07 Is the Test Equipment for Aircraft Fuel Pump customizable?

Yes, Neometrix offers customized versions of the rig tailored to specific fuel-control unit types, pressure ranges, and customer-specified test parameters.

Q · 08 Does the equipment comply with relevant standards?

Yes, the Test Equipment for Aircraft Fuel Pump is designed to comply with applicable national and international standards including MIL-STD, ISO, IS, and customer-specified aerospace requirements.

Q · 09 What control and monitoring features does the rig include?

The rig includes a PLC/HMI-based control cabinet with real-time pressure and temperature monitoring, a 10-point pressure-gauge readout panel, indicator lamps, and safety interlocks for controlled, repeatable preliminary regulation runs.

Q · 10 How can I get a quotation, and does Neometrix export this equipment internationally?

Yes, Neometrix Engineering Pvt Ltd exports the Test Equipment for Aircraft Fuel Pump to defence and aerospace customers internationally. You can request a quotation via the contact form on this page or by reaching out to Neometrix directly by email or phone.

Get a proposal

Tell us your fuel-control unit
and test parameters.

We size the ATF power pack, pressure ratings, and control cabinet configuration to your NR-31BT1 (or equivalent unit) test requirements, and walk through commissioning with your quality engineering team.

Request proposal +91 7777 876 876

Test Equipment for Aircraft Fuel Pump, built for NR-31BT1 preliminary regulation.

Preliminary regulation, done before the unit ever sees an engine.