Commonwealth legislation

AD/CESSNA 207/18 - Ammeter Type and Position

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This Act has been repealed and is no longer in force. It is retained for historical reference.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 airworthiness directive warns Cessna 207 owners/operators of a wiring fault where centre-zero ammeters wired to the alternator line can falsely read zero and hide battery discharge or electrical failures. You must inspect for the modification or alternator connection, and if incorrect reconnect the ammeter to the battery line per Cessna diagrams. A simple battery-master/landing-light test confirms the fault. Compliance: within 100 flight hours after 30 Sept 1978.

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AD/CESSNA 207/18 - Ammeter Type and Position

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Cessna 207 Series Aeroplanes

AD/CESSNA 207/18 Ammeter Type and Position 9/78

Applicability: All models.

Requirement: 1. Inspect aircraft to ascertain if the ammeter has been modified as per Rex Drawing RA-A-1109 or if a centre zero ammeter (charge/discharge type) is connected in the alternator line.

Reconnect centre zero ammeter (charge/discharge type) into the battery line as per original Cessna wiring diagrams.

Note: This requirement can be quickly checked by switching on the battery master switch (alternator not running) and a load such as a landing light switch and noting the following:

(a) if the ammeter reads below zero in the discharge sector then it is connected in the battery line.

(b) if the ammeter still reads zero when a load is applied it is quite possibly connected in the alternator line and needs to be reconnected into the battery line.

Compliance: Within the next 100 hours time in service after 30 September 1978.

Source text

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

1 AD/CESSNA 207/18 - Ammeter Type and Position