AD 88-12-51 R1

88-12-51 R1 BOEING OF CANADA, LTD., DE HAVILLAND DIVISION: Amendment 39- 6076. Final copy of, and revision to, Telegraphic AD 88-12-51 issued June 10, 1988.

Applies to Model DHC-8-100 series airplanes, Serial Numbers 1 through 113, certificated in any category.

Compliance required as indicated, unless previously accomplished.

To prevent inadvertent unfeathering of the propeller, accomplish the following:

A. Within 24 hours after the effective date of this AD, insert the following note into the Emergency Operating Procedures Section of the Airplane Flight Manual (AFM) [PSM-1-81- 1A(FAA)], and alert all flight crews. This may be accomplished by inserting a copy of this airworthiness directive into the front of the Emergency Operating Procedures Section (Section 4) of the AFM:

"NOTE: Should an engine failure or fire after V1 occur: Ensure that the emergency procedures of paragraphs 4.1.2., 4.2.1., and 4.2.2 of PSM 1-81-1A(FAA) are followed. The ENGINE SHUTDOWN check, paragraph 4.2.1., is not to be commenced until entering the third segment of the takeoff path. On commencement of the ENGINE SHUTDOWN or ENGINE FIRE (IN FLIGHT) check, paragraph 4.2.1. or 4.2.2, respectively, the check should be completed sequentially and uninterrupted to its conclusion."

B. Installation of the modification to the propellers-autofeather latching logic wiring, in accordance with de Havilland Service Bulletin 8-61-12, Revision A, dated October 28, 1988, constitutes terminating action for the requirements of paragraph A., above, and the required "NOTE" may be removed from the AFM.

C. An alternate means of compliance which provides an acceptable level of safety may be used when approved by the Manager, New York Aircraft Certification Office, FAA, New England Region.

All persons affected by this directive who have not already received the appropriate service information from the manufacturer, may obtain copies upon request to Boeing of Canada, Ltd., de Havilland Division, Garrett Boulevard, Downsview, Ontario M3K 1Y5, Canada. This information may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or at FAA, New England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York.

This amendment revises Telegraphic AD T88-12-51, issued June 10, 1988.

This amendment, 39-6076 (AD 88-12-51 R1), becomes effective December 12, 1988.