78-25-03 THE DEUTSCH COMPANY, METAL COMPONENTS DIVISION: Amendment 39-3363. Applies to P/N 94B0100004F0160 and 94F0100004F0166 hose assemblies marked with identification 4Q77 or 1Q78 which may be installed on various aircraft but which are known to be installed on Piper Models PA-23-250, PA-28R-180, PA-28R-200, PA-28R-201, PA-28R-201T, PA-31, PA-31-300, PA-31-325, PA-31-350, PA-31P, PA-31-TI, PA-31-T, PA-34-200T, and PA-44-180 aircraft.
NOTE 1: Hose P/N and manufacturing date codes (e.g. 4Q77 and 1Q78) are shown on a metal tag attached to the hose assemblies.
a) Deutsch P/N 94B0100004F0160 is Piper P/N 17766-27, TSO C-53a Type A.
b) Deutsch Part No. 94F0100004F0166 is Piper P/N 63901-41, TSO C-53a Type C.
Compliance required as indicated, unless already accomplished.
To prevent an unsafe condition in the various aircraft systems in which these hoses may be installed, accomplish the following:
A. Within the next ten hours time in service after the effective date of this (AD), inspect to determine if hose assembly P/N 94B0100004F0160 or 94F0100004F0166 with manufacturing date 4Q77 or 1Q78 is installed.
B. If the hose assemblies as in A above are not installed no further action is required by this (AD).
C. If the hose assemblies in A above are installed, prior to further flight,
(1) Remove and replace hose assemblies.
(2) Check system for contamination. Purge system if evidence of contamination is found.
NOTE 2: Piper Service Bulletin No. 611 refers to purging procedures for Piper Models PA -28, -34, and -44. Piper Service Bulletin No. 629 refers to purging procedures for Piper Models PA-31 and PA-23.
NOTE 3: The following is a list of Piper Model, Serial Nos. and hose application which are believed to have suspect hoses installed. Possible hose application is not limited to this list.
Model
Serial Number
Application
Qty. of hoses
PA-23-250
Aztec F
27-7854007 thru 27-7954018
Pressure nose gear cylinder up and pressure anti-retract valve
2
PA-28R-180
Possible Retrofit
NLG actuating cylinder
2
PA-28R-200
Possible Retrofit
NLG actuating cylinder
2
PA-28R-201
78-37105 thru 78-37317
NLG actuating cylinder
2
PA-28R-201T
78-03154 thru 78-03372
NLG actuating cylinder
2
Manifold pressure at left hand rear of engine
1
PA-31
31-1 thru 31-7812122
and
31-5001 thru 31-7852166
Main landing gear actuating cylinders
2
PA-31-300
Possible Retrofit
Main landing gear actuating cylinders
2
PA-31-325
Navaho C/H
31-7812016 thru
31-7912004
Main landing gear actuating cylinders
2
PA-31-350
& PA-31-P
Possible Retrofit
Main landing gear actuating cylinders
2
PA-31TI
Cheyenne I
31T-7804001 thru
31T-7904006
Main landing gear actuating cylinders
2
PA-31T Cheyenne, Cheyenne II
31T-77200069
thru
31T-7920012
Main landing gear actuating cylinders
2
PA-34-200T
78-70100 thru 78-70474
Fuel drains
4
PA-44-180
79-95001thru 79-95127
Engine oil pressure line at filter
2
D. Special flight permits may be issued in accordance with FARs 21.197 and 21.199 to operate aircraft to a base for the accomplishment of the inspection required by paragraph A of this AD.
E. Equivalent inspections and repairs may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.
F. Upon submission of substantiating data, through an FAA Aviation Safety Inspector, the Chief, Aircraft Engineering Division, FAA Western Region may adjust the compliance time for hose replacement.
This amendment becomes effective January 15, 1979, for all persons except those to whom it was made effective by priority message dated October 27, 1978.