Commonwealth legislation

AD/CESSNA 185/11 - Non-Return Valves in Electric Fuel Pump Bypass Line

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

4/10 complexity

This Airworthiness Directive applies to owners/operators of Cessna 185s with dual Bendix auxiliary fuel pumps and requires inspection and testing of the electric pump bypass one‑way (non‑return) valve, with mandated modification or replacement for certain valve types.

It matters because a faulty valve can allow fuel to flow backward or block proper fuel flow, risking pump failure and possible engine shutdown in flight.

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Current sections

Direct links to the current provisions in AD/CESSNA 185/11 - Non-Return Valves in Electric Fuel Pump Bypass Line.

AD/CESSNA 185/11 - Non-Return Valves in Electric Fuel Pump Bypass Line

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Cessna 185 Series Aeroplanes

AD/CESSNA 185/11 Non-Return Valves in Electric

Fuel Pump Bypass Line Applicability: All models with dual Bendix auxiliary fuel pump installation. Requirement: 1. Identify the electric fuel pumps bypass non-return valve.

10/66

2. If the non-return valve is Republic Manufacturing Company P/N 485-6D-1, modify or replace as required in paragraph 4 or 5.

3. If the non-return valve is other than Republic P/N 485-6D-1, test the valve in situ, as called up in Section 13 of the Cessna 100 Series Service Manual for trouble shooting the fuel system of the Model 185. Where the suspected cause is a defective check valve in the electric fuel pumps bypass line disconnect the outlet and inlet lines from the non-return valve. If fuel flows from the inlet line but not through the valve, the valve is defective and must be rectified or replaced.

4. Modify the non-return valve in accordance with an approved scheme to ensure that the opening pressure is not greater than 8 inches of water, and permanently mark on the valve “OPENS 8 in. WATER”.

5. Alternatively, replace Republic P/N 485-6D-1 valve by Parker aircraft Company valve P/N 1111-517702 or Dukes Astronautics Valve P/N 367-00 and rework the system in accordance with the attached Figure 1.

Compliance: Before 1 January 1967.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source

Source text

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

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?xml version="1.0" encoding="utf-8" standalone="no"?>

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Cessna 185 Series Aeroplanes

AD/CESSNA 185/11 Non-Return Valves in Electric

Fuel Pump Bypass Line Applicability: All models with dual Bendix auxiliary fuel pump installation. Requirement: 1. Identify the electric fuel pumps bypass non-return valve.

10/66

2. If the non-return valve is Republic Manufacturing Company P/N 485-6D-1, modify or replace as required in paragraph 4 or 5.

Compliance: Before 1 January 1967.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES