Commonwealth legislation

AD/F28/48 Amdt 1 - Horizontal Stabilizer Control Unit Cavity Venting

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This Airworthiness Directive requires replacing closed plugs in the cavity of specified Fokker F28 horizontal stabilizer control units with vented plugs, following Fokker SB F28/27-161 and Menasco SB27-93, to stop hydraulic buildup between systems 1 and 2 (Requirement; Background).

It applies to listed P/No. 11100-series units and serial numbers (prefixes removed), obliges operators to carry out and pay for the work before further flight after 30 Sept 1985, and cross-references RLD AD 85-36 (Applicability; Compliance).

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/F28/48 Amdt 1 - Horizontal Stabilizer Control Unit Cavity Venting.

AD/F28/48 Amdt 1 - Horizontal Stabilizer Control Unit Cavity Venting

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/F28/48

Amdt 1

Horizontal Stabilizer Control Unit Cavity Venting 3/86

Applicability: All models with S/Nos. 11003 to 11211, 11213 to 11218, 11222, 11991 and 11992 fitted with Horizontal Stabilizer Control Units P/No. 11100 - (all dash numbers below

- 39AA) S/Nos -001 to -386 disregarding all prefixes.

Requirement: Action in accordance with Fokker SB F28/27-161 and subsequent issues, and Menasco SB27-93.

Note 1: Fokker SB F28/27-161 draws the attention of operators to the requirements of Menasco SB27-93.

Note 2: RLD AD 85-36 refers.

Compliance: Before further flight after 30 September 1985.

Background: Leakage of a clutch piston seal into the cavity between hydraulic systems 1 and 2 can cause increased seal friction which can lead to a decrease in control unit reliability.

To prevent any hydraulic build up within the cavity the existing closed plugs are replaced with vented plugs. This AD has been amended to remove the prefixes from the Stabilizer Control Unit Serial numbers.

Federal Register of Legislative Instruments F2006B09782

Source text

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

1 AD/F28/48 Amdt 1 - Horizontal Stabilizer Control Unit Cavity Venting