AD/BELL 407/25 Amdt 1 - Tail Rotor Drive Shaft Bearings (Cth)

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/BELL 407/25 and issues the following AD under subregulation 39.1 (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.

Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters

AD/BELL 407/25 Amdt 1

Tail Rotor Drive Shaft Bearings 11/2004 DM

Applicability: Bell Helicopter Textron Canada (BHTC) Model 407 helicopters. Requirement: 1. Revised Flight Limitations: For helicopters serial number (S/N) 53000 through 53518:

1. Install oil cooler blower inlet ducts and bearing airflow shields in accordance with Bell Helicopter Textron Canada (BHTC) Alert Service Bulletin (ASB) 407-02-54 Revision A or later and;

b. Incorporate temporary revision (TR-10) Revision 1 into Flight Manual BHT- 407-FM-1.

2. Oil Cooler Blower Shaft Bearings:

For helicopters S/N 53000 through 53579:

1. Replace oil cooler blower shaft bearings in accordance with BHTC ASB 407-04-63 Revision A.

b. Inspect oil cooler blower shaft bearings in accordance with BHT ASB 407- 04-63 Revision A.

c. Lubricate oil cooler blower shaft bearings in accordance with BHTC ASB 407-04-63 Revision A.