69-12-08 AERO COMMANDER DIVISION, NORTH AMERICAN ROCKWELL CORPORATION: Amdt. 39-782. Applies to Aero Commander Model 1121 series airplanes, S/N 3 through 150.
Compliance required as indicated unless already accomplished.
To prevent failures of fuel supply system hose assemblies, P/N AE700024-1, 6723008- 65, 6723008-67, 67-23008-149, and 6723008-179, accomplish the following:
(a) Within the next 15 hours' time in service after the effective date of this AD,
(1) pressurize the engine fuel supply system by opening the fuel shutoff valves and turning the fuel boost pumps on. Visually inspect the fuel system flexible hose assemblies, P/N AE700024-1, 6723008-65, 6723008-67, 6723008-149, and 6723008-179 for any indications of leakage. Replace any defective hose assembly in accordance with paragraph (c),
(2) install fuel valve switch guards, P/N 5883082-93, or the equivalent approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, FAA, on the fuel control panel in accordance with Aero Commander Service Bulletin No. J-7 dated May 13, 1969, or later FAA approved revision or in a accordance with a method approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, FAA,
(3) insert FAA approved Airplane Flight Manual Revision dated April 9, 1969 in the applicable Airplane Flight Manual.
(b) Within the next 100 hours' time in service after the effective date of this AD, remove the fuel supply flexible hose assemblies referenced in paragraph (a)(1), unless replaced with new hose assemblies in accordance with paragraph (c), and vacuum test these flexible hose assemblies for separation of the hose liner material from the wire braid reinforcing cover in accordance with Part II of Aero Commander Service Bulletin No. J-7 dated May 13, 1969, or later FAA approved revision or in accordance with an equivalent method approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, FAA.
(c) Replace any defective hose assemblies found as a result of the inspections required by paragraphs (a)(1) and (b), before further flight, following procedures outlined in Part II, steps d., e., and f. of Aero Commander Service Bulletin No. J-7 dated May 13, 1969, or later FAA approved revision, with new hose assemblies of the same part number or the equivalent approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, FAA.
This amendment becomes effective June 21, 1969.