Commonwealth legislation

AD/CESSNA 150/14 Amdt 1 - Pneumatic Stall Warning System

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legislative instrument

Plain English Summary

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This airworthiness directive requires operators of Cessna 150/152-series aeroplanes with pneumatic stall‑warning systems (where the horn reed assembly or protective screens are not the listed part numbers) to perform a simple pre‑flight suction test at the left‑wing stall‑warning opening before each flight and to fit a cockpit placard reading “PRE-FLIGHT TEST THE PNEUMATIC STALL WARNING SYSTEM.” Pilots may perform and certify the check. Alternatively, owners can install updated reed assemblies and mesh screens and perform a flight test to remove the recurring checks. The amendment updates Cessna part numbers and gives a one‑off modification option in place of ongoing preflight checks.

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AD/CESSNA 150/14 Amdt 1 - Pneumatic Stall Warning System

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Cessna 150, F150, 152 & F152 Series Aeroplanes

AD/CESSNA 150/14

Amdt 1

Pneumatic Stall Warning System 6/83

Applicability: All models with pneumatic stall warning systems not incorporating horn reed assembly P/N 0413483-2, P/N 0713348-1 or subsequent and protective screens over the horn bell and stall warning system opening on the left wing.

Requirement: 1. Check the pneumatic stall warning system for correct operation by applying a slight suction with the mouth at the stall warning opening in the left wing. A properly functioning horn will provide a sound that is clearly audible. It may be advisable to first cover the opening with a clean piece of cloth. Cessna 100 Series Service Manual 1963 to 1967 Section 16 refers.

Note: This check may be performed and certified by the pilot.

2. Install the following placard in full view of the pilot:

“PRE-FLIGHT TEST THE PNEUMATIC STALL WARNING SYSTEM”.

3. The requirements of paragraphs 1 and 2 may be removed by incorporation of the following modifications. Replace the stall warning reed assembly P/N 0413028-1 with reed assembly P/N 0413483-2, P/N 0713348-1 or subsequent and install an 18 x 14 or 18 x 16 mesh screen over the exposed horn bell inside the cabin and over the left wing opening. Flight test the aircraft to assure the stall warning horn sounds at 5 to 10 knots above the stalling speed.

Compliance: For para. 1 - Before each flight.

For para. 2 - Within 25 hours time in service after 5 September 1968.

Background: This amendment reflects latest Cessna Part Number change.

Source text

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

1 AD/CESSNA 150/14 Amdt 1 - Pneumatic Stall Warning System