AD 80-25-07 R1 Stewart Oil Cooler
September 24, 1981
This AD applies to Stewart Warner Oil Coolers installed on 152s.
If the oil cooler has 10 hours or less, remove it and send it in for a new one.
If the oil cooler has more than 10 hours on it, it must be inspected prior to every flight. If it’s leaking it has to be replaced. If it’s not leaking, go fly.
80-25-07 R1 STEWART-WARNER CORPORATION: Amendment 39-4028 as amended by Amendment 39-4220. Applies to the following Stewart-Warner oil cooler models:
NOTE: The affected oil coolers were manufactured between July 1, 1979, and November 1, 1980. Oil coolers of the above model and serial numbers that have a date ink stamped next to the nameplate have been inspected by Stewart-Warner and found satisfactory for continued use.
These oil coolers may be installed on, but not limited to, the following aircraft:
Bellanca Models: 7ECA, 7GCAA, 7GCBC, 7KCAB, 8GCBC, and 8KCAB.
Cessna Models (including Reims Aviation): 152, A152, F152, FA152, 172I, 172K, 172L, 172M, 172N, 172P, 172RG, F172L, F172M, F172P, 177, 177A, 177B, 177RG, F177RG, R182, FR182, TR182, T182, A188B, T188C, 210N, T210N, and P210N.
Piper Model: PA-38-112.
Mooney Models: M20C, M20E, M20F, M20G, and M20J.
Great Lakes Models: 2T-1A-1 and 2T-1A-2.
Beech Models: 269 Series.
Compliance is required prior to further flight after the effective date of this AD, unless already accomplished. To prevent the loss of engine oil, accomplish the following:
1. If the oil cooler has accumulated 10 hours or less total time in service since new, prior to further flight, replace with an airworthy oil cooler not of the above serial numbers or with an airworthy oil cooler of the above serial numbers that have a date ink stamped next to the oil cooler name plate.
NOTE: Removed oil coolers may be returned to: Stewart-Warner Corp., Attn: Mr. Ben Gillen, 1514 Drover Street, Indianapolis, Indiana 46221.
2. If the oil cooler has accumulated more than 10 hours time in service since new, visually inspect the cooler for oil leakage prior to further flight.
NOTE: Removal of the engine cowling is not required if it can be positively determined from inspection of areas adjacent to the oil cooler that the oil cooler is not leaking.
A. If oil leakage is evident, prior to further flight, replace with an airworthy oil cooler not of the above serial numbers or with an airworthy oil cooler of the above serial numbers that have a date ink stamped next to the oil cooler name plate.
B. If oil leakage is not detected:
i. Fabricate and install the following placard on the aircraft instrument panel in plain view of the crew, using letters 1/8-inch high minimum:
“Visually check oil cooler for leakage prior to each flight. If leakage is detected, refer to AD Number 80-25-07.”
NOTE: The owner or operator may make and install this placard and conduct the preflight check. This check does not require a logbook entry. The inspection procedures identified in the note following paragraph 2 also apply to this preflight check.
ii. If the oil cooler is replaced with an airworthy oil cooler not of the above serial numbers or with an airworthy oil cooler of the above serial numbers that have a date ink stamped next to the oil cooler name plate, the placard can be removed.
3. Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, 2300 East Devon Avenue, Des Plaines, Illinois 60018, telephone (312) 694-7357.
Amendment 39-4028 became effective January 29, 1981, as to all persons except those to whom it was made immediately effective by the priority mail letter dated December 5, 1980, which contained this amendment.
This amendment 39-4220 becomes effective September 24, 1981.