Commonwealth legislation

AD/JETSTREAM/77 - Stall Warning - Removal of Ground Inhibit Switch

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This directive requires operators of BAe Jetstream 3100 and 3200 aircraft fitted with Modification JM7813A or JM7813B to remove the stall-warning ground-inhibit function by following BAe Alert Service Bulletin 27-A-JM7847, completed by 26 June 1998. CASA made the directive effective 26 March 1998. The change undoes an earlier modification that delayed stall warnings on the ground because a relay failure could disable the system without crew indication. Operators pay for and schedule the maintenance to comply. (Requirement; Background)

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AD/JETSTREAM/77 - Stall Warning - Removal of Ground Inhibit Switch

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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British Aerospace BAe 3100 (Jetstream) Series Aeroplanes

AD/JETSTREAM/77 Stall Warning - Removal of Ground Inhibit Switch

4/98

Applicability: All BAe Regional Aircraft Jetstream 3100 and 3200 Series aircraft with Modification JM7813A (SB 27-JM7813A) or Modification JM7813B embodied.

Requirement: Unless previously accomplished, remove the ground inhibit function of the stall warning system in accordance with BAe Alert Service Bulletin 27-A-JM7847.

Note: CAA UK AD 003-12-97 refers.

Compliance: No later than 26 June 1998.

This airworthiness directive becomes effective on 26 March 1998.

Background: Modification JM7813 installed a ground inhibit relay and ground test relay to prevent the operation of the stall warning system until the aircraft has been airborne for at least three seconds. Investigation by BAe has shown that a failure of the ground test relay in the energised position would cause a failure in the stall warning system with no indication to the crew of the malfunction.

Source text

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

1 AD/JETSTREAM/77 - Stall Warning - Removal of Ground Inhibit Switch