Commonwealth legislation

AD/CESSNA 170/19 Amdt 1 - Pneumatic Stall Warning System

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legislative instrument

Plain English Summary

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This directive applies to Cessna 170/172/175-series aeroplanes using older pneumatic stall‑warning systems. It requires the pilot to perform a simple mouth‑suction pre‑flight check before every flight and to fit a visible cockpit placard within 25 hours, unless the owner replaces the reed assembly with specified part numbers and fits protective screens and then flight‑tests the horn to confirm it sounds 5–10 knots above stall. Owners/operators pay for parts/installation; pilots perform and certify the check, changing pre‑flight routine and equipment costs.

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AD/CESSNA 170/19 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 170, 172, F172, FR172 and 175 Series Aeroplanes

AD/CESSNA 170/19

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 3 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 170/19 Amdt 1 - Pneumatic Stall Warning System