Commonwealth legislation

AD/B737/88 - Horizontal Stabiliser Trim Electric Actuator

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legislative instrument

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AD/B737/88 — Horizontal stabiliser trim actuator replacement.

This directive requires operators of certain Boeing 737-300/-400/-500 aircraft to replace a specific horizontal stabiliser trim electric actuator (P/N 10-62033-3) with a modified, re-identified unit (P/N 10-62033-4) per Boeing Alert Service Bulletin 737-27A1191 Rev 1; the old part may not be installed after 12 December 1995 and full replacement must occur by the prescribed date. The stated purpose is to prevent reduced controllability caused by a binding clutch; operators pay parts and labour and must follow the service bulletin method.

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AD/B737/88 - Horizontal Stabiliser Trim Electric Actuator

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 737 Series Aeroplanes

AD/B737/88 Horizontal Stabiliser Trim Electric Actuator 8/95

Applicability: Model 737-300, -400 and -500 series aircraft identified in Boeing Alert Service Bulletin 737-27A1191 Revision 1 dated 3 November 1994.

Requirement: Replace horizontal stabilizer trim electric actuator Part Number (P/N) 10-62033-3 with an actuator that has been modified and re-identified as P/N 10-62033-4, in accordance with Boeing Alert Service Bulletin 737-27A1191 Revision 1 dated

3 November 1994.

Note: FAA AD 95-10-05 Amdt 39-9222 refers.

Compliance: Prior to 12 June 1996, except that actuators P/N 10-62033-3 may not be installed in an aircraft after 12 December 1995.

Note: Actuator P/N 10-62033-3, if installed in an aircraft prior to 12 December 1995, may remain fitted in that aircraft until removed in accordance with Requirement 1.

Background: Several operators have reported instances where the stabilizer trim wheel continued to turn when the stabilizer trim switches were operated and released. A binding condition of a clutch disc in the stabilizer trim electric actuator was found to be the cause of the reported incidents. Action specified by this Directive is intended to prevent reduced controllability of the airplane caused by the binding clutch.

Source text

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

1 AD/B737/88 - Horizontal Stabiliser Trim Electric Actuator