Transport Transports 

Canada Canada

 TP 7245E

 

AIRWORTHINESS DIRECTIVE

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your name. ADs are issued pursuant to Canadian 

Aviation Regulation (CAR) 521 Division X. Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H, the continuing airworthiness of a Canadian registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the aircraft. 

Alternative means of compliance shall be applied for in accordance with CAR 605.84 and the above-referenced Standard. 

This AD has been issued by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Canada, Ottawa, telephone 613 952-4357.

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall, within seven days, notify the Minister in writing of any change of his or her name or address. 

To request a change of address, contact the Civil Aviation Communications Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8, or 1-800-305-2059, or www.tc.gc.ca/civilaviation/communications/centre/ address.asp 

24-0022 (01-2005)

1/2 No.

CF-2013-25

Issue Date 

 15 August 2013 

Number: CF-2013-25 

Subject: Emergency Locator Transmitter – Battery Wiring Installation Discrepancies 

Effective: 26 August 2013 

Applicability: Honeywell ASCa Inc. Emergency Locator Transmitter (ELT) model RESCU 406AF and 

406AFN with Transmitter Unit (TU) part numbers 1152682-1, -2 and -3 

Note: These ELT TUs are known to be installed on, but not limited to the following 

aeroplane series/models and/or their variants: 

The Boeing Company: 717, 727, 737, 747, 757, 767, 777, 787, MD-11, MD-80 and MD-90 

Lockheed Martin Corporation: 382 

Airbus: A300, A310, A320, A321, A330, A340 and A380 

ATR – GIE Avions de Transport Régional: ATR42 and ATR72 

Dassault Aviation: Falcon 7X 

Compliance: Within 150 days from the effective date of this AD, unless already accomplished. 

Background: Following an event where a fire broke out on a parked and unoccupied aeroplane, the 

United Kingdom Air Accidents Investigation Branch (AAIB) carried out an investigation to 

determine the cause of the fire. Although the investigation is still ongoing, preliminary 

information indicated that there was combustion in the area of the ELT TU. Subsequent to 

the fire event, inspection of in-service ELT TUs revealed battery wiring installation 

discrepancies inside the TU that may result in an electrical short. The AAIB noted that in 

case of an electrical short, the ELT battery could provide the energy for an ignition. 

This AD is issued as a precautionary measure to address the possibility of a fire due to 

wiring installation discrepancies of either the ELT TU or the ELT Battery. Depending on the 

outcome of the AAIB investigation, Transport Canada may revise this AD or mandate 

additional corrective actions. 

Corrective 

Actions: 

1. Carry out a one-time inspection of the ELT TUs listed in the applicability section of this 

AD, and having serial numbers listed in the Effectivity section of Honeywell Alert Service 

Bulletin 1152682-23-A22, Revision 1, in accordance with the Accomplishment 

Instructions of Honeywell Alert Service Bulletin (ASB) 1152682-23-A22, Revision 1,

dated 8 August 2013, or later revisions approved by the Chief, Continuing Airworthiness, 

Transport Canada. For TUs installed on aeroplanes, remove the TU prior to the 

inspection using instructions specified by the aeroplane manufacturer or local 

airworthiness authority. 

2. If any discrepancy is found during the inspection, carry out the applicable rectification in 

accordance with the Accomplishment Instructions of the above-noted ASB prior to 

returning the TU to service. 
No.

N° CF-2013-25 2/2 

3. Reinstall any TU that has been removed from the aeroplane, using instructions specified 

by the aeroplane manufacturer or local airworthiness authority and perform any 

applicable return to service action in accordance with the Accomplishment Instructions 

of the above-noted ASB. 

4. Inspections and rectifications carried out in accordance with the Accomplishment 

Instructions of Revision 0 of the above-noted ASB prior to the effective date of this AD 

meet the requirements of paragraphs 1 to 3 of this AD. 

5. Inspections and rectifications carried out in accordance with the following Boeing Multi 

Operator Messages prior to the effective date of this AD meet the requirements of 

paragraphs 1 to 3 of this AD. 

Boeing Multi Operator Message Number

MOM-MOM-13-0597-01B 

MOM-MOM-13-0593-01B 

MOM-MOM-13-0594-01B 

MOM-MOM-13-0595-01B 

MOM-MOM-13-0596-01B 

MOM-MOM-13-0570-01B 

6. As of the effective date of this AD, no person shall follow the maintenance instructions of 

Honeywell Component Maintenance Manuals (CMM) that were published prior to those 

listed below, when carrying out battery replacements on ELT TUs listed in the 

applicability section of this AD. 

Transmitter Unit part numbers Honeywell CMM Temporary Revision 

1152682-1 23-24-01 Revision 8 23-1 

1152682-2, -3 23-24-02 Revision 7 23-1 

1152682-2 (installed on Boeing 

787 only) 

23-24-04 Revision 2 23-1 

Authorization: For the Minister of Transport, 

Philip Tang 

Acting Chief, Continuing Airworthiness 

Contact: Philip Tang, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

613-996-9178 or e-mail AD-CN@tc.gc.ca or any Transport Canada Centre.