Commonwealth legislation

AD/F50/87 - Pitot & Static Port Heating Wiring

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This Airworthiness Directive requires operators of Fokker F.27 Mk.050, Mk.0502 and Mk.604 aeroplanes to modify pitot and static-port heating wiring in accordance with Fokker Service Bulletin F50-30-028, with compliance required within 36 months of 5 August 2004.

It responds to a reported incident where a failed pitot heater went undetected, producing erroneous airspeed from the air data computer and an uncommanded nose-down/overspeed during IAS-mode autopilot; operators and maintainers bear the cost and scheduling burden of the mandated wiring change.

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/F50/87 - Pitot & Static Port Heating Wiring.

AIRWORTHINESS DIRECTIVE

View image in the official source

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

View image in the official source

Fokker F50 (F27 Mk 50) Series Aeroplanes

AD/F50/87 Pitot & Static Port Heating Wi

AD/F50/87 Pitot & Static Port Heating Wiring 8/2004

Applicability: Model F.27 Mk.050, Mk.0502 and Mk.604 aeroplanes, all serial numbers. Requirement: Modify the wiring of the pitot and static port heating in accordance with Section 2 -

Accomplishment Instructions of Fokker Service Bulletin F50-30-028 dated 4 March 2004 or Revision 1 dated 26 April 2004.

Note 1: Fokker Services Manual Change Notification - Maintenance Documentation (MCNM) F50-048 dated 4 March 2004 also pertains to this subject.

Note 2: CAA-NL AD 2004-038 (A) Corr refers.

Compliance: Within the next 36 months after the effective date of this Directive. This Airworthiness Directive becomes effective on 5 August 2004.

Background: The Netherlands CAA has received a report from a Fokker 50 operator of intermittent events where, during autopilot engagement in IAS-Mode decent, the aircraft suddenly pitched nose down resulting in an overspeed situation. Investigation revealed a failed heater element in the left hand upper pitot-static tube, which was not detected by the current sensor, and as a result no “PITOT HEAT” alert was generated. In a single air data computer (ADC) configuration only pressure from the left hand upper pitot head is used. In this instance freezing of the pitot head resulted in erroneous ADC airspeed output

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Fokker F50 (F27 Mk 50) Series Aeroplanes

AD/F50/87 Pitot & Static Port Heating Wi AD/F50/87 Pitot & Static Port Heating Wiring 8/2004

AD/F50/87 Pitot & Static Port Heating Wiring 8/2004

Applicability: Model F.27 Mk.050, Mk.0502 and Mk.604 aeroplanes, all serial numbers. Requirement: Modify the wiring of the pitot and static port heating in accordance with Section 2 -

Accomplishment Instructions of Fokker Service Bulletin F50-30-028 dated 4 March 2004 or Revision 1 dated 26 April 2004.

Note 1: Fokker Services Manual Change Notification - Maintenance Documentation (MCNM) F50-048 dated 4 March 2004 also pertains to this subject.

Note 2: CAA-NL AD 2004-038 (A) Corr refers.

Compliance: Within the next 36 months after the effective date of this Directive. This Airworthiness Directive becomes effective on 5 August 2004.