88-10-02 DEHAVILLAND AIRCRAFT COMPANY OF CANADA, A DIVISION OF BOEING OF CANADA, LTD.: AMENDMENT 39-5905. Applies to all Model DHC-8-100 series airplanes, Post Mod. 8/0794 (Digital Air Data Computer (DADC) P/N 7000700-975), not equipped with an Electronic Flight Instrument System (EFIS), certificated in any category. Compliance required as indicated, unless previously accomplished.
To preclude erroneous Flight Director or Autopilot VOR operations, accomplish the following:
A. Within 48 hours after the effective date of this AD:
1. Include the following limitation in the limitations section of the Airplane Flight Manual (AFM). This may be accomplished by inserting a copy of this AD in the AFM: "Operation in Flight Director VOR and VOR approach mode, or Autopilot VOR and VOR approach mode, is prohibited."
2. Install a placard adjacent to the Flight Guidance Controller on the glare shield, stating: "VOR MODES PROHIBITED"
B. Installation of DADC P/N 7000700-975 Mod BF, in accordance with Part B of de Havilland Service Bulletin A8-34-53, Revision B, dated April 1, 1988, constitutes terminating action for the requirements of paragraph A., above.
C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, New York Aircraft Certification Office, FAA, New England Region.
D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.
All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to The de Havilland Aircraft Company of Canada, A Division of Boeing of Canada, Ltd., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. This information may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or FAA, New England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York.
This amendment becomes effective May 18, 1988.