77-09-01 HUGHES: Amendment 39-2882. Applies to Model 369H Series Helicopters certificated in all categories, configured with emergency floats assemblies Hughes P/N 369H92036-1 and 369H92036-2.
Compliance required within 100 flight-hours time in service or within 30 days from effective date of this AD, whichever is sooner, unless already accomplished.
(a) To prevent failure of the emergency float solenoid valve to operate due to corrosion of the solenoid valve plunger, accomplish the following:
(1) Replace the TAVCO, INC. solenoid valve assembly P/N 23111357 (Air Cruiser's P/N's D17753-101 or -103) with Air Cruiser's P/N D17753-107 valve assembly with the word (MOD) imprinted after the serial number in accordance with the procedure instructions of the FAA approved Hughes Service Information Notice No. HN-114, dated April 15, 1977 or later FAA approved revision, or;
(2) Valcor Eng. Corp solenoid valve P/N V48800-02 (Air Cruiser's P/N D17740-101) may be used in lieu of Air Cruiser's P/N 17753-107 solenoid valve in accomplishment of paragraph (a), or;
(3) An equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region.
(b) Special flight permits may be issued in accordance with FAR's 21.197 and 21.199 to operate helicopters to a base for accomplishment of the modifications required by this AD.
This amendment becomes effective May 3, 1977.