maintenance manual for emergency locator … · 503-35, 503-35-1, 503-35a, 503-35aa, 503-35-am...

MAINTENANCE MANUALFOR

EMERGENCY LOCATOR TRANSMITTER

TYPE 503 SERIES

Issue 13 - 21.05.15CN TT7120HRS1013-04-02

Commercial In Confi dence

TechtestLimited

Street Court

Kingsland, Leominster

Herefordshire HR6 9QA, England

Telephone: +44(0)1568 708 744

E-mail: [email protected]

Fax: +44(0)1568 708 713

www.hr-smith.com

EmergencyLocationand RescueEquipment


Issue 13 - 21.05.15 - CN TT7120HRS1013-04-02

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Preface

This manual is a controlled document, and as such is subject to amendment. It is in the interest of the user to register this manual with Techtest Limited to ensure receipt of any amendments.

Amendments subsequent to the Initial Issue will bear the number of the amendment with which it was issued. Changes of technical import within each new or revised leaf will be identifi ed by a marginal indicator. Such indicators will be omitted when the leaf is next re-issued. When the whole of the chapter is so changed or reorientated that the inclusion of amendment indicators would be impracticable, the words “(Completely Revised)” will appear at the head of the relevant chapter.

Any queries regarding this manual should be addressed to:

Product SupportTechtest LimitedStreet CourtKingslandLeominsterHerefordshireHR6 9QAU.K.

Tel. +44 (0) 1568 708 744 Fax. +44 (0) 1568 708 713Email: [email protected]


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Amendments Record

Issue number Changed by Date/ C/N Reference Pages Affected

FOR PREVIOUS ISUES REFER TO ARCHIVES

13 S. Prescott 21.05.15/ CN TT7120 13 & 14 Drawings updated


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- CONTENTS - PAGE

Preface 1 Contents 3 SECTION 1. SYSTEM DESCRIPTION 5

2. LINE REPLACEMENT UNITS (LRUs) 5 2.1 Emergency Locator Transmitter 52.2 G-Switch 52.3 Remote Controller 62.4 Mounting Rack 62.5 Interface Unit 62.6 Water Activated Switch 62.7 Antenna 7 3. ELT INHIBIT FACILITY 7

3.1 Inhibit Facility 73.2 Inhibit Connection 7

4. SERVICING 7

4.1 Physical Inspection 74.2 Battery Replacement 84.3 Troubleshooting 84.4 Diagnose Mode 84.5 Repair 9 4.6 Antenna 94.7 Operation 9

5. RECHARGING & CONDITIONING THE G-SWITCH BATTERY PACK 9 5.1 Testing the Battery Pack 9

6. ILLUSTRATED PARTS 11

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1. SYSTEM DESCRIPTION

The Techtest Limited 503 Series of Emergency Locator Transmitter (ELT) is a battery powered unit that on activation, provides full emergency frequency operation at 121.5 MHz, 243.0 MHz and 406.025 MHz.

The 503 ELT can be used as a fi xed or fi xed/ portable system, with options of two or three axis G-Switch units for automatic activation of the beacon should the aircrew not have activated the beacon prior to the emergency. The system can include an interface unit, which is designed to update the 406.025 MHz transmission with the latest onboard positional data.

The Remote Controller for the ELT system makes it possible to test and operate the ELT from the aircrew positions and an in-built sounder and lamp indicates the system status. An external antenna is mounted on the airframe in a position most likely to survive an accident.

The Water Activated Switch provides the ELT with automatic activation upon immersion in salt or fresh water.

By design the 503 ELT system is modular in construction and a number of confi gurations can be assembled.

This manual covers the system module by module and then comments on the various confi gurations. The reader has to select the sections of this manual that are relevant to the particular installation on the aircraft.

2. LINE REPLACEMENT UNITS (LRU’s)

2.1 ELT 503-1 (Figure 1)

The ELT is manufactured in high visibility yellow thermoplastic. It is self contained and has its own long life battery, control switch and antenna port.

The battery (A0673-1) has an installed unused life of 5 years and will always provide, as a minimum, 24 hours use at 406.025 MHz (5 watts) and 48 hours use at 121.5 MHz and 243.0 MHz (0.1 watts).

The 503-1 forms the basic transmitting unit which, in the portable mode, can be operated as a stand alone unit provided that an antenna is connected.

The battery can be changed without the use of tools by simply depressing two locks, one either side of the unit, with fi nger pressure and simultaneously sliding the battery out. Replacement batteries are simply slid into position and the locks engaged.

2.2 G-Switch 503-7 Series, 503-19 Series, 503-35 Series & 503-36 Series (Figures 2 & 3)

The G-Switch forms an essential part of the fi xed ELT system.Dependant upon the model in the particular system, the G-Switch triggers the ELT into transmission when the ‘G’ force exceeds a preset limit in TWO or THREE bidirectional axis. The G-Switch is always installed along with the ELT and is

connected via the 9 pin connector.

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2.3 Remote Controller 503-4, 503-17, 503-20, 503-52 & 503-53 (Figures 4 & 5)

The Remote Controller is a small switch unit from which the aircrew can test / reset the ELT, or switch it ON in an emergency, before the G-Switch automatically activates the system.

The front panel has an indicator lamp and the unit has a sounder inside which gives an audible tone.

The 503-52 Remote Controller is the same as the 503-20 but is mounted vertically

2.3.1 AF/AP ELT Cockpit Control Panel 503-51 (Figure 6)

The AF/AP Cockpit Control Panel has similar functions to the 503-20 but with an additional Fault indicator and Inhibit switch.

2.4 Mounting Rack A0637 Series To be effective the G-Switch has to be mounted to coincide with the expected ‘G’

forces in any accident. It is therefore necessary to mount the G-Switch to the airframe in the correct attitude and ensure that the ELT is permanently connected to the G-Switch.

The mounting rack will be positioned to best withstand high ‘G’ loading in the event of an emergency and may not be readily located.

2.4.1 Fixed Mounting Tray (Figure 7)

The Fixed Mounting Tray is secured to the airframe by the four Dzus fasteners or four fi xing screws.

2.4.2 Fixed / Portable Tray (Figures 8 & 9)

The Fixed / Portable Tray is secured to the airframe by six fi xing screws except for Figure 9 which has nine fi xing screws. The ELT can, as required, be withdrawn from the rack. In the installed position the G-Switch, which is pre-installed into the rack, is coupled to the ELT and has an RF lead to the antenna.

Should the ELT be required as a stand alone unit the antenna lead is disconnected, the toggle clip is lifted and the ELT withdrawn from the rack. A portable antenna is provided and is stowed along the top of the ELT rack, this should be removed and fi tted to the ELT. The ELT can then be switched on and used as a portable ELT unit.

2.5 Interface Unit 503-15 Series (Figure 10)

The Interface Unit is designed to pass GPS data to the ELT such that the 406.025 MHz transmission can pass positional data to the satellite. The Interface Unit can be JAA (ED62) compatible or FAA (RTC/DO-204) compatible in order to provide the required interface. The change is a link in the interface connector and is not switchable by the operator.

2.6 Water Activated Switch 503-23-1 (Figure 11)

The Water Activated Switch provides the ELT system with automatic activation upon immersion in salt or fresh water.

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2.7 Antenna (Figures 12 - 19)

External to the aircraft a three frequency antenna transmits the signal. The antenna can be anyone of the antenna types shown in Figures 12 to 18. The antenna shown in Figure 19 is used when the ELT is operated in the portable mode. This antenna is stowed ready for use on the mounting tray.

3. ELT INHIBIT FACILITY

Note: This section applies only to the G-Switch variants incorporating an inhibit facility.

These variants are:

503-7-3, 503-7-3INH, 503-7-4, 503-7-12INH, 503-7-14, 503-19-1, 503-19-2, 503-19-2A, 503-19-4, 503-19-5, 503-19-7, 503-19-8, 503-19-10, 503-19-11, 503-19-12, 503-35, 503-35-1, 503-35A, 503-35AA, 503-35-AM & 503-35A-AM

For all other G-Switch variants, Pins 10, 11 & 12 on the G-Switch should not be connected.

3.1 Inhibit Facility

The Inhibit Facility (where incorporated) allows the installation of a separate switch to disable (inhibit) the operation of the G-Switch. When inhibited, the ELT cannot be activated due to ‘G’ levels or by selecting ‘ON’ at either the Remote Controller or G-Switch. The self test function is also disabled.

3.2 Inhibit Connection

To inhibit the ELT system, Pins 10, 11 or 12 on the G-Switch are connected to ground (aircraft chassis). This is achieved via a separate switch, available on the 503-51, which allows the inhibit function or normal operation to be selected.

4. SERVICING

The sealed for life construction, and Built in Testing, limits the servicing that is required, or necessary, to maintain the beacon in a fully serviceable state.

The periodicity of servicing set out below is a recommendation and can be varied to suit the type of operational use and operating conditions.

4.1 Physical Inspection

It is recommended that the ELT system is inspected for damage at the following periodicity.

Antenna - Daily Control Unit - Monthly Emergency Locator Beacon - 3 months


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4.2 Battery Replacement

The ELT battery must be changed every 5 years or sooner, if the ELT has been used for any other purpose than the Built in Test.

The G-Switch battery must be changed every 2.5 years, and has a storage life of 5 years.

4.3. Troubleshooting

The ELT system consists of a sealed for life ELT beacon complete with battery. An additional G-Switch and remote controller switch are included to enable the ELT to be switched to ON either on impact or by the aircrew.

Since the ELT has an in built test system and the test function can be activated at the ELT and at either of the two switches, the system can be tested.

A test failure at the remote control switch indicates a switch failure, a G-Switch failure, a wiring failure or an ELT failure. A test at the ELT beacon will indicate the status of the beacon. If a fail then replace the beacon, if a pass then test the switch and wiring loom.

A test failure from the G-Switch test switch shows the fault condition to be in the G-Switch or ELT.

A test at the ELT will indicate pass or fail. Fail will indicate a faulty ELT, a pass indicates a faulty G-Switch

The testing of the remote controller switch is a simple continuity test and the ELT

itself cannot be tested other than the built in test. The G-Switch is electrically tested by inducing an overload condition into the solid state ‘G’ switches. If such a failure occurs then the G-Switch should be replaced.

If using the 503-51, a BIT failure is indicated by the FAULT lamp illuminating.

4.4 Diagnose mode

This mode is used when a G-Switch/ELT system has failed its self-test and been removed from the aircraft, and is useful to an operator to indicate what part of the system has failed.

Note:- An antenna or equivalent load must be connected to the ELT when performing tests.

The G-Switch needs to be connected to a 28V power supply and a remote controller. System diagnosis is performed by ensuring that the locking toggle switch on the G-Switch is in the centre OFF position, and switching it to armed whilst the test switch is held in the test position. When a single bleep is heard, the test switch is released. The G-Switch will then test the system, but rather than just giving six bleeps to indicate a failure, will produce differing numbers of bleeps according to the fault(s) as follows: -

Bleeps Fault

2 Communications failure between the G-Switch and ELT.3 G Force sensor 0 failure.4 G Force sensor 1 failure.5 G Force sensor 3 failure.7 ELT battery failure.8 ELT RF failure9 ELT test failure

10 Sounder failure

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A single bleep indicates that the diagnostics are completed. In the event of more

than one fault there is a one-second gap between each set of bleeps. The G-Switch will not be able to read the ELT test results if there is a communications failure.

4.5 Repair

No maintenance over and above physical inspection and battery replacement is possible at other than at the manufacturers.

4.6 Antenna

The antenna and R.F feeder should be subject to VSWR test using a Techtest 12-602-3 on an annual basis.

4.7 Operation

When any part of the ELT system is disturbed the built in test should be initiated (see Operating manual) and the results recorded. Actual transmitted data can be monitored on a Test Set 12-503-1

Note : The Test Set has its own separate manual.

5. RECHARGING & CONDITIONING THE G-SWITCH BATTERY PACK

Overview

The G-Switch is fi tted with a removable re-chargeable battery pack consisting of fi ve Nickel Metal Hydride cells series connected, with a protection device. The function of the battery pack is to provide power to the G-Switch in the event of the aircraft losing electrical power. The capacity of the battery pack is high in comparison with the current drawn by the G-Switch .

The G-Switch charging circuit works as follows. When the battery is fully discharged

there is a set time in trickle charge, (as fast charging a completely discharged battery can damage it) followed by a fast charge. When fully charged, trickle charging re-commences.

5.1 TESTING THE BATTERY PACK

Testing a battery under load is the best way to gauge its condition. The following table of measurements are intended to help ascertain the condition of the battery pack, but is only intended as guide.

BATTERY CONDITION TERMINAL STATUS POTENTIAL

Just completed charging cycle Open circuit 6.5V to 7.2VJust completed charging cycle 100 Ohm resistor

connected across terminals6.9V

dropping rapidly15 minutes after test on load 100 Ohm resistor

connected across terminals6.5V

dropping slowly

After testing the battery can be put back on trickle charge to replace any lost charge.


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INTENTIONALLY LEFT BLANK

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6. ILLUSTRATED PARTS

Figure 1 ELT 503-1 (with battery fi tted)

Recessed ON/OFFTest/Reset switch

Battery removal clip

RF OutputTNC connector

503-1 ELT

A0673-1ELT battery pack

G-Switch interfaceconnector

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Figure 2G-SWITCH

503-7 & 503-19

26 way ‘D’ typeConnection to

503-1 Transmitter

Figure 3G-SWITCH with GPS

503-35 & 503-36

26 way ‘D’ type Connection to503-1 Transmitter

GPS

ARM/OFF/ONToggle Switch

TEST/RESETSwitch

ARM/OFF/ONToggle Switch

TEST/RESETSwitch

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Figure 5 REMOTE CONTROLLER

503-52

9 way ‘D’ type connectorfi tted with screwlocks

DZUS Fasteners

ON/Test/ResetSwitchSystem Function

Indicator Lamp

Figure 4 REMOTE CONTROLLER

503-4, 503-17, 503-20 & 503-53

DZUS Fasteners

9 way ‘D’ type connectorfi tted with screwlocks

ON/Test/ResetSwitch

System FunctionIndicator Lamp


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Figure 7 FIXED MOUNTING TRAY

A0637-1, A0637-3, A0637-5

Figure 6 AF/AP ELT COCKPIT CONTROLLER

503-51

19 way circular connector

DZUS Fasteners

Transmit Switchwith guard

Inhibit Switchwith guard

Test/Reset button

Fault Indicator

Transmit/TestIndicator

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10-274-1 Portable Antenna

Quick ReleaseBuckle and Strap

Figure 9 QUICK RELEASE TRAY

A0637-8

Figure 8 FIXED / PORTABLE MOUNTING TRAY

A0637, A0637-6

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Figure 10 INTERFACE UNIT

503-15 Series

Figure 11WATER ACTIVATED SWITCH

503-23-1

3 way circular connector Air Outlet hole

Water Inlet holes

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Figure 1210-102-19 ANTENNA





Issue 13 - 21.05.15 - CN TT7120HRS1013-04-02




Figure 1710- 152-19 ANTENNA

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maintenance manual for emergency locator … · 503-35, 503-35-1, 503-35a, 503-35aa, 503-35-am...

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