AD/HU 369/121 Amdt 2 - Vertical Stabilizer Control System Adapter Tubes (Cth)

Federal Register of Legislation

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AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/HU 369/121 Amdt 1 and issues the following AD under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters AD/HU 369/121 Amdt 2 Vertical Stabilizer Control System 13/2008 TX Adapter Tubes

Applicability: Model 500N and Model 600N helicopters, with Yaw Stability Augmentation System (YSAS) adapter tubes, part number (P/N) 500N7218-1, installed. Requirement: 1. Turn the YSAS switch OFF.

Note 1: MDHI Service Bulletin SB500N-040R1/SB600N-047R1 dated 27 August 2008, MDHI maintenance manual CSP-HMI-3, Section 96-00-00, pertain to the subject of this AD.

Note 2: The original issue of this AD required the CB to be pulled and collared. Ensure that the CB is un-collared and reset.

2. Install a placard on the instrument panel as close as practicable to the airspeed indicator that states:

"YSAS SYSTEM IS OFF. AIRPSEED LIMIT 100 KIAS or VNE, WHICHEVER IS LESS."

3. Make pen and ink changes or place a copy of this AD in the airworthiness limitations section of the Rotorcraft Flight Manual (RFM) to revise the airworthiness limitations as follows:

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Document text

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters AD/HU 369/121 Amdt 2 Vertical Stabilizer Control System 13/2008 TX Adapter Tubes

Applicability: Model 500N and Model 600N helicopters, with Yaw Stability Augmentation System (YSAS) adapter tubes, part number (P/N) 500N7218-1, installed. Requirement: 1. Turn the YSAS switch OFF.

Note 1: MDHI Service Bulletin SB500N-040R1/SB600N-047R1 dated 27 August 2008, MDHI maintenance manual CSP-HMI-3, Section 96-00-00, pertain to the subject of this AD.

Note 2: The original issue of this AD required the CB to be pulled and collared. Ensure that the CB is un-collared and reset.

2. Install a placard on the instrument panel as close as practicable to the airspeed indicator that states:

"YSAS SYSTEM IS OFF. AIRPSEED LIMIT 100 KIAS or VNE, WHICHEVER IS LESS."

3. Make pen and ink changes or place a copy of this AD in the airworthiness limitations section of the Rotorcraft Flight Manual (RFM) to revise the airworthiness limitations as follows:

Read full text →