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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
Amendment 39-3908; AD 80-19-01
Airworthiness Directives; Piper Model PA-28R-180, PA-28R-200, PA-28R-201 and PA-28RT-201 Airplanes
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AGENCY: Federal Aviation Administration, DOT
DATES: Effective September 12, 1980.
80-19-01 PIPER AIRCRAFT CORPORATION: Amendment 39-3908. Applies to Model PA-28R-180 serial numbers 28R-30002 through 28R-7130013; Model PA-28R-200 serial numbers 28R-35001 through 28R-7635545; PA-28R-201 serial numbers 28R-7737001 through 28R-7837317; and PA-28RT-201 serial numbers 28R-7918001 through 28R-8018088 airplanes certificated in all categories.
Compliance required within the next 50 hours time in service after the effective date of this AD unless already accomplished.
To prevent possible leakage of carbon monoxide into the cabin, accomplish the following:
(a) Remove upper and lower engine cowling.
(b) Remove and discard clips on muffler shroud end plates shown on Figure 1.
(c) Inspect for movement between the muffler shroud end plates and the muffler pipes.
(d) If there is no relative movement, the muffler assembly is acceptable and no modification is necessary.
(e) If relative movement is observed, accomplish the following:
(1) Remove and disassemble the muffler and shroud assembly from the engine and inspect all parts for wear and cracking. Repair or replace as necessary.
NOTE: During the inspection required inn (1), direct particular attention to the muffler shroud end plates and the mating area of contact on the muffler tubes.
(2) Rework the end plates to provide a 0.030 inch minimum gap between the plates after assembly as shown in Figures 1 and 2.
(3) Slot the two 0.141 inch holes in the top of the shroud assembly to allow the screws to be installed without causing deformation of the shroud skin.
(4) Install the two screws holding the shroud assembly on the bottom side of the muffler prior to installing the strap clamps but do not tighten until the top screws are in place.
(5) Install the strap clamps, tightening to a torque of 25 to 30-inch pounds.
(6) Install and tighten the two top screws then tighten the bottom screws.
(7) Inspect the muffler and shroud assembly for tightness. If relative motion still exists between the muffler pipes and the muffler shroud end plates, repeat steps (1) through (6) until any relative motion is eliminated.
(8) Reinstall the muffler assembly in the aircraft using new exhaust gaskets, Lycoming part number 65321, and torque exhaust stack nuts to 120 to 170-inch pounds.
(f) Make an appropriate maintenance record entry.
An equivalent method of compliance may be approved by the Chief, Engineering and Manufacturing Branch, Federal Aviation Administration, Southern Region.
NOTE: Piper Service Bulletin No. 691, dated August 6, 1980, pertains to this subject.
This amendment becomes effective September 12, 1980.
FIGURE 1 AD