75-04-05 ROCKWELL INTERNATIONAL: Amendment 39-2087. Applies to all NA- 265 Series Airplanes certificated in all categories.
Compliance as indicated, unless already accomplished.
To provide protection in the event of an unknown incipient failure condition in the engine fuel pressure switch, Hydra-Electric Co. P/N 12251, accomplish the following:
(a) Within 10 hours' time in service after the effective date of this AD, inspect the engine fuel pressure switches for fuel seepage or leakage.
(1) If seepage or leakage is found, replace the failed switch before further flight, in accordance with Sabreliner Service Bulletin 74-34, dated January 15, 1975, revised January 24, 1975, or later FAA-approved revisions.
(2) If seepage or leakage is not found, repeat the inspection at intervals not to exceed 10 hours' time in service until the inspection and installation described in (b) are accomplished.
(b) Within 90 days after the effective date of this AD, conductan inspection to determine the part number of the engine fuel pressure switch installed in accordance with steps 1 through 3 of Sabreliner Service Bulletin 74-34, dated January 15, 1975, revised January 24, 1975, or later FAA-approved revisions.
(1) If Hydra-Electric Co. P/N 12251 is found installed, either
(i) Accomplish the installation described in steps 4 through 10 of Sabreliner Service Bulletin 74-34, dated January 15, 1975, revised January 24, 1975, or later FAA-approved revisions, prior to further flight; or
(ii) Repeat (a) above, until the installation described in (b)(1)(i) is accomplished. The installation required by (b)(1)(i) is to be performed within 90 days after the effective date of this AD.
(c) If P/N 1B2522-25 (Aero Instruments Co., or Century Electronics and Instrument Inc., or Hathaway Industries, or Electro Controls Inc.), or P/N 685-1, Value Engineering Products, is installed, proceed with steps 8 through 10 of Sabreliner Service Bulletin74-34, dated January 15, 1975, revised January 24, 1975, or later FAA-approved revisions.
(d) Airplanes may be flown to a base for the performance of the inspections and installations required by this AD, per FAR's 21.197 and 21.199, except when seepage or leakage is known to exist.
(e) Return P/N 12251 switches removed from service to Rockwell International, Aviation Services Division, Lambert Field, St. Louis, Mo. 63145.
(f) Equivalent inspections and installations may be approved by the Chief, Aircraft Engineering Division, FAA Western Region, upon submission of adequate substantiating data.
This amendment becomes effective February 18, 1975.