Airworthiness Directive · Amendment 39-13827 · deHavilland Inc. Models DHC-2 Mk. I and DHC-2 Mk. II Airplanes and Bombardier Inc. Model (Otter) DHC-3 Airplanes
deHavilland Inc. Models DHC-2 Mk. I and DHC-2 Mk. II Airplanes and Bombardier Inc. Model (Otter) DHC-3 Airplanes
Superseded. A later AD replaced this one: AD 2008-12-12. Comply with the one in force.
This AD affects the following airplane models and serial numbers that are certificated in any category:
| Model | Serial Nos. |
|---|---|
| deHavilland DHC-2 Mk. I | All. |
| deHavilland DHC-2 Mk. II | All. |
| Bombardier (Otter) DHC-3 | All serial numbers powered by radial engines. |
The FAA adopts a new airworthiness directive (AD) for all deHavilland Inc. Models DHC-2 Mk. I and DHC-2 Mk. II airplanes and for all Bombardier Inc. Model (Otter) DHC-3 airplanes powered by radial engines. This AD requires you to visually inspect the firewall connector plugs for proper lockwire security and replace or modify as appropriate. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Canada. We are issuing this AD to prevent loss of ignition systems during flight caused by improper lockwire security, which could result in engine failure. This failure could lead to a forced landing of the airplane.
To address this problem, you must do the following:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Inspect the following: (i) connector plugs on the fore side of the firewall for security; (ii) the connector plug lockwire to ensure it is intact and the holes in the plugs are not broken out or cracked. | Initially inspect within the next 100 hours time-in-service (TIS) after December 6, 2004 (the effective date of this AD). Repetitively inspect thereafter at intervals not to exceed 100 hours TIS | Follow deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; and deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004, as applicable. |
| (2) If during any inspection required in paragraph (e)(1)(i) and (e)(1)(ii) of this AD: (i) the lockwire holes are found damaged, replace the connector plug with a new part of the same number; and (ii) the lockwire is damaged, replace the lockwire. | Prior to further flight after any inspection required by paragraphs (e)(1)(i) and (e)(1)(ii) of this AD | Follow deHavilland Beaver Alert Service Bulletin Number A2/53, Revision B, dated May 28, 2004; and deHavilland Otter Alert Service Bulletin Number A3/53, Revision B, dated May 28, 2004, as applicable. |
| (3) When the connector plugs are replaced, do an operational check of the magnetos and correct as appropriate | Prior to further flight after any replacement required by paragraph (e)(2)(i) this AD | Follow the applicable maintenance manual procedures. |
Note: We recommend you insert de Havilland Inc. Temporary Revision No. 2-24, dated August 24, 2001, and Temporary Revision No. 14, dated August 24, 2001, into the applicable maintenance manual.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
