Commonwealth legislation

AD/750XL/9 - S-Tec X 55 Autopilot System - Disconnect

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

What this does: This safety order (called an Airworthiness Directive) targets three specific Pacific Aerospace 750XL aircraft—serial numbers 125, 126, and 127. It requires operators to disconnect the S-Tec X 55 autopilot system and install a warning placard before flying again after 12 March 2007.

Why it matters: The autopilot computer has a fault that could fail in flight. If it fails, the aircraft might become dangerously unbalanced ("out of trim"), potentially making the plane uncontrollable.

What needs to happen:

Disconnect the autopilot system
Install a placard (basically a warning sticker) in the cockpit
Check the manufacturer's Alert Service Bulletin PACASB/XL/001 for technical details
Comply before the aircraft next flies after the deadline

The directive aligns with a similar safety notice issued in New Zealand (CAA(NZ) AD DAC/750XL/12).

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Current sections

Direct links to the current provisions in AD/750XL/9 - S-Tec X 55 Autopilot System - Disconnect.

Pacific Aerospace 750XL Series Aeroplane

Pacific Aerospace 750XL Series Aeroplanes

AD/750XL/9	S-Tec X 55 Autopilot System – Disconnect	5/2007 TX

Applicability:	Model PAC 750XL aircraft, S/Ns 125, 126 and 127.
Requirement:	Disconnect the autopilot and install a placard. Pacific Aerospace Limited 750XL Alert Service Bulletin PACASB/XL/001 dated 16 February 2007 refers.DO NOT USENote: CAA(NZ) AD DAC/750XL/12 refers.
Compliance:	Before further flight after 12 March 2007.
	This Airworthiness Directive becomes effective on 12 March 2007.
Background:	To prevent failure of the Autopilot System Computer resulting in the possibility of an out of trim condition, which may lead to loss of aircraft control.

View image in the official source
Charles Lenarcic
Delegate of the Civil Aviation Safety Authority

9 March 2007

AD/750XL/9

S-Tec X 55 Autopilot System — Disconnect

S-Tec X 55 Autopilot System – Disconnect

5/2007 TX

Source text

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

Pacific Aerospace 750XL Series Aeroplane Pacific Aerospace 750XL Series Aeroplanes

Pacific Aerospace 750XL Series Aeroplanes

AD/750XL/9	S-Tec X 55 Autopilot System – Disconnect	5/2007 TX

Applicability:	Model PAC 750XL aircraft, S/Ns 125, 126 and 127.
Requirement:	Disconnect the autopilot and install a placard. Pacific Aerospace Limited 750XL Alert Service Bulletin PACASB/XL/001 dated 16 February 2007 refers.DO NOT USENote: CAA(NZ) AD DAC/750XL/12 refers.
Compliance:	Before further flight after 12 March 2007.
	This Airworthiness Directive becomes effective on 12 March 2007.
Background:	To prevent failure of the Autopilot System Computer resulting in the possibility of an out of trim condition, which may lead to loss of aircraft control.

Charles Lenarcic
Delegate of the Civil Aviation Safety Authority

9 March 2007

AD/750XL/9 - S-Tec X 55 Autopilot System - Disconnect

Plain English Summary

Deep dive

Current sections

Pacific Aerospace 750XL Series Aeroplanes

Pacific Aerospace 750XL Series Aeroplanes

AD/750XL/9

AD/750XL/9

S-Tec X 55 Autopilot System — Disconnect

S-Tec X 55 Autopilot System – Disconnect

5/2007 TX

5/2007 TX

Source text

Pacific Aerospace 750XL Series Aeroplane Pacific Aerospace 750XL Series Aeroplanes

Pacific Aerospace 750XL Series Aeroplanes

AD/750XL/9 AD/750XL/9

AD/750XL/9

S-Tec X 55 Autopilot System — Disconnect S-Tec X 55 Autopilot System — Disconnect

S-Tec X 55 Autopilot System – Disconnect

5/2007 TX 5/2007 TX

5/2007 TX