Commonwealth legislation

AD/RAD/52 - Rockwell International, Collins Air Transport Division DME-700

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Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive requires operators to update Rockwell/Collins DME‑700 distance measuring units with the listed part numbers and serial ranges by installing specified Collins Service Bulletins (including the prerequisite SB20) by 31 March 1995. The Civil Aviation Safety Authority issues the mandate; aircraft operators and maintenance organisations must perform the modifications, bearing inspection, parts, labour and downtime costs. The stated purpose is to prevent intermittent ‘sleeping’ or ‘deaf’ DME behaviour that causes erroneous or frozen distance indications.

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AD/RAD/52 - Rockwell International, Collins Air Transport Division DME-700

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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Radio Communication and Navigation Equipment

AD/RAD/52 Rockwell International, Collins Air Transport Division DME-700

Applicability: Rockwell International, Collins Air Transport Division, DME- 700 Distance Measuring Equipment, all serial numbers, with the following part numbers:

4/94

622-4540-020, 622-4540-021, 622-4540-022, 622-4540-120, and 622-4540-121.

Note: These equipments are known to be installed on, but not limited to the following aircraft series:

Airbus Industrie A300, A310, A300-600, A320 and A340 Boeing 737, 747-400, and 767

Fokker F-100

McDonnell Douglas MD-11 and MD-80

Requirement: Unless previously accomplished, incorporate Collins Air Transport Division Service Bulletins in accordance with the following Table:

Collins SB	Dated	Applicable DME-700 Part Numbers
SB 20 Revision 1	30 August 1991	622-4540-020 and -120, with serial<br>numbers 1 through 4247 inclusive.
SB 25	11 November 1992	622-4540-020,, -021 and -022. SB 20<br>Revision 1 must be installed on applicable part numbers, prior to, or in conjunction with SB 25. SB 24 is incorporated by SB 25.
SB 26	21 October 1992	622-4540-120 and -121. SB 20 Revision 1 must be incorporated in applicable part numbers, prior to, or in conjunction with SB 25. SB 26 eliminates the requirement for SB 21.

Note: FAA AD 94-02-02 Amdt 39-8799 refers.

Compliance: Prior to 31 March 1995.

Background: Several operators have reported random instances of erroneous DME indications, the affected units failing to process and update distance outputs. Additionally, some units have been reported as establishing a continuous restart mode upon application of power. These conditions are known colloquially as sleeping’ or deaf’ modes of operation. Compliance with this Directive will effectively prevent units from displaying these characteristics.

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

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?xml version="1.0" encoding="utf-8" standalone="no"?>

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Radio Communication and Navigation Equipment

AD/RAD/52 Rockwell International, Collins Air Transport Division DME-700

Applicability: Rockwell International, Collins Air Transport Division, DME- 700 Distance Measuring Equipment, all serial numbers, with the following part numbers:

4/94

622-4540-020, 622-4540-021, 622-4540-022, 622-4540-120, and 622-4540-121.

Note: These equipments are known to be installed on, but not limited to the following aircraft series:

Airbus Industrie A300, A310, A300-600, A320 and A340 Boeing 737, 747-400, and 767

Fokker F-100

McDonnell Douglas MD-11 and MD-80

Requirement: Unless previously accomplished, incorporate Collins Air Transport Division Service Bulletins in accordance with the following Table:

Collins SB	Dated	Applicable DME-700 Part Numbers
SB 20 Revision 1	30 August 1991	622-4540-020 and -120, with serial<br>numbers 1 through 4247 inclusive.
SB 25	11 November 1992	622-4540-020,, -021 and -022. SB 20<br>Revision 1 must be installed on applicable part numbers, prior to, or in conjunction with SB 25. SB 24 is incorporated by SB 25.
SB 26	21 October 1992	622-4540-120 and -121. SB 20 Revision 1 must be incorporated in applicable part numbers, prior to, or in conjunction with SB 25. SB 26 eliminates the requirement for SB 21.

Note: FAA AD 94-02-02 Amdt 39-8799 refers.

Compliance: Prior to 31 March 1995.

Background: Several operators have reported random instances of erroneous DME indications, the affected units failing to process and update distance outputs. Additionally, some units have been reported as establishing a continuous restart mode upon application of power. These conditions are known colloquially as deaf’ modes of operation. Compliance with this Directive will effectively prevent units from displaying these characteristics.