Commonwealth legislation

AD/GENERAL/55 Amdt 2 - Directional Gyros - Inspection

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This mandatory airworthiness directive requires operators of IFR aircraft with directional gyros lacking crew-accessible latitude correction to verify those instruments are set or proven suitable for the aircraft’s operating latitudes. Where gyros have preset latitude correctors, confirm the correct region is selected; otherwise check for Earth-rotation–induced drift or hold manufacturer evidence the gyro is accurate.

It matters because uncorrected drift can produce heading errors; compliance is required before an Australian Certificate of Airworthiness or at the next major inspection.

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/GENERAL/55 Amdt 2 - Directional Gyros - Inspection.

AD/GENERAL/55 Amdt 2 - Directional Gyros - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Aircraft - General

AD/GENERAL/55

Amdt 2

Directional Gyros - Inspection NK

Applicability: All IFR aircraft fitted with directional gyros that do not have latitude correctors available to the flight crew.

Requirement: 1. For Directional Gyros with precalibrated latitude correctors, ensure appropriate latitude is selected.

For Directional Gyros without precalibrated latitude correctors, check for drift due to the earth rotation unless information is available that shows that the gyro is suitable for the latitude in which the aircraft is intended to operate. -

Note 1: Directional Gyros adjusted for zero earth rate at the equator are generally acceptable for operations in Australia.

Note 2: Where a Directional Gyro forms part of a system (such as a magnetic compass system), information which shows that the system characteristics in each mode of operation are suit-able for the latitude in which the aircraft is intended to operate, is sufficient to show compliance with paragraph 2.

Compliance: Before issue of Australian Certificate of Airworthiness, or at next major inspection after 1 January 1980 for those aircraft already certificated.

Source text

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

1 AD/GENERAL/55 Amdt 2 - Directional Gyros - Inspection