67-07-02 DASSAULT: Amdt. 39-354, Part 39, Federal Register February 25, 1967. Applies to Fan Jet Falcon Airplanes, Serial Numbers 1 thru 69, except, Numbers 59, 62, 63, and 67.
Compliance required as indicated, unless already accomplished.
To prevent inflight jamming of the horizontal stabilizer actuator, accomplish the following:
(a) Within the next 10 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 50 hours' time in service from the date of the last inspection, inspect the horizontal stabilizer actuator jack assembly, P/N's 21-59-0 or 21-59-1-A, for the presence of moisture in accordance with AMD Service Bulletin No. 270 (27-34), dated January 13, 1967, or later SGAC-approved revision.
(b) If, during the inspections required by (a), the jack body and electric motors show no trace of moisture, before further flight, drill a drain port in the covers of the actuator motors, P/N SEB993A, in accordance with AMDService Bulletin No. 88, Revision 2, dated January 10, 1967, or a later SGAC-approved revision. If the jack body is dry but the motors show traces of moisture, before further flight, dry the motors and comply with the requirements of the first sentence of this paragraph. If the jack body shows traces of moisture, before further flight, dry the jack and replace both the normal and emergency motors, P/N SEB993A, with motors P/N CEB993B.
(c) Within the next 200 hours' time in service after the inspection required by (a), replace the actuator jack assembly, P/N's 21-59-0 or 21-59-1-A with a modified jack, P/N's 21- 59-0-E or 21-59-1-B. Upon accomplishing this replacement, the inspection requirements of (a) may be discontinued.
This directive effective March 2, 1967.