Commonwealth legislation

AD/F28/73 Amdt 1 - Passenger Door Lock Warning System

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This Airworthiness Directive requires operators of specified Fokker F28 aircraft (all models except Mk 0100 that have Service Bulletin F28/52‑72 incorporated) to modify the passenger door lock warning system in accordance with Fokker Service Bulletin F28/52‑101 (or Revision 1).

It is issued after incidents of doors opening shortly after take-off, sets a retrofit deadline (original compliance before 4 Sep 1993; this issue before 1 Nov 1993), and places the cost, scheduling and compliance burden on aircraft operators to maintain the aircraft’s airworthiness.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/F28/73 Amdt 1 - Passenger Door Lock Warning System.

AD/F28/73 Amdt 1 - Passenger Door Lock Warning System

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Fokker F28 Series Aeroplanes

AD/F28/73

Amdt 1

Passenger Door Lock Warning System 10/93

Applicability: All Model F28 (except Mk 0100), all serial numbers which have Service Bulletin F28/52-72 incorporated.

Requirement: Action in accordance with Fokker SB F28/52-101 dated 1 November 1988 or Revision 1 dated 24 August 1992.

Note: RLD AD 92-117/2 (A) dated 12 July 1993 refers.

Compliance: The original compliance was prior to 4 September 1993. The compliance for this issue is prior to 1 November 1993.

Background: For some time, incidents have been reported of passenger doors opening shortly after take-off. In each case, an improperly locked door was left unobserved by cabin crews, while flight crews probably overlooked the DOOR UNLOCKED warning light during their pre-flight checks.

In 1988 Fokker issued service Bulletin F28/52-101 to improve the passengers door lock warning system. All the incidents occurred on aircraft on which this particular improvement had not been incorporated. Although the existing door lock warning system should be adequate, a recent incident, in which a door opened at 21,000 feet, prompted another review of the system. Fokker considers that all occurrences could have been avoided if this modification had been accomplished.

The RLD and CAA concur with this view and since the unsafe condition described may exist or develop on other aircraft of the same type design, this Airworthiness Directive requires the modification of the passenger door lock warning system.

This amendment is issued following the amendment of the RLD Airworthiness Directive and changes the applicability to aircraft in a post SB F28/52-72 configuration.

Source text

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

1 AD/F28/73 Amdt 1 - Passenger Door Lock Warning System