AD 2013-08-05

Within the next 30 days after May 30, 2013 (the effective date of this AD) or within the next 10 hours time-in-service (TIS) after May 30, 2013 (the effective date of this AD), whichever occurs first, do the following:

(1) Inspect the number of hours on the A/C compressor hour meter; and

(2) Check the airplane logbook for any entry for replacing the A/C compressor motor brushes with new brushes or replacing the compressor motor or compressor condenser module assembly (pallet) with a motor or assembly that has new brushes.

(i) If the logbook contains an entry for replacement of parts as specified in paragraph (g)(2) of this AD, determine the number of hours on the A/C compressor motor brushes by comparing the number of hours on the compressor motor since replacement and use this number in paragraph (h) of this AD; or

(ii) If through the logbook check you cannot positively determine the number of hours on the A/C compressor motor brushes as specified in paragraph (g)(2)(i) of this AD, you must use the number of hours on the A/C compressor hour meter to comply with the requirements of this AD and use this number in paragraph (h) of this AD or presume the brushes have over 500 hours TIS.

At whichever of the compliance times in paragraph (h)(1) of this AD or paragraph (h)(2) of this AD occurs later, using the hour reading on the A/C compressor hour meter determined in paragraph (g) of this AD, replace the A/C compressor motor brushes with new brushes. Record the hours on the A/C compressor hour meter in the maintenance records at the time of replacement and repetitively thereafter replace the A/C compressor motor brushes no later than every 500 hours TIS on the A/C compressor motor. Do the replacement following Page 1, of Subject 4-11-00, dated April 23, 2012, of Cessna Aircraft Company Model 525 Maintenance Manual, Revision 23, dated July 1, 2012.

(1) Before or when the A/C compressor motor brushes reach a total of 500 hours TIS; or

(2) Before further flight after the inspection required in paragraph (g)(2)(ii) of this AD if the A/C compressor motor brush hours cannot be positively determined.

In lieu of replacing the A/C compressor motor brushes, before or when the A/C compressor motor brushes reach a total of 500 hours TIS, you may deactivate the A/C. Remove the fuse limiter that supplies power to the A/C compressor motor, fabricate and install a placard that states: “A/C DISABLED.” Install the placard by the A/C selection switch prohibiting use of the vapor cycle air conditioner and document deactivation of the system in the airplane logbook referring to this AD as the reason for deactivation.

Note 1 to paragraph (i) of this AD: While the system is deactivated, we recommend airplane operators remain aware of the operating temperature limitations found in the Cessna March 2013 temporary revision to the airplane flight manual.

(1) Do the steps in paragraphs (i)(1)(i) through (i)(1)(viii) of this AD to remove the compressor fuse limiter.

(i) Open aft baggage compartment.

(ii) Remove aft baggage compartment dividers.

(iii) Disconnect the main battery connector from the battery.

(iv) Tag the battery and external power receptacle with a warning tag that reads: “WARNING: Do not connect the battery connector or external power cart during the maintenance in progress.”

(v) Remove wing nuts that attach the cover to the aft power J-Box.

(vi) Remove the aft power J-Box cover.

(vii) Remove nuts securing compressor fuse limiter (Reference Designator HZ028, P/N ANL100) to bus bar. Retain nuts.

(viii) Remove the compressor motor fuse limiter from the terminals and retain for future reinstallation once compressor motor brushes have been replaced.

(2) A properly certified mechanic must fabricate and install the placard as specified in paragraphs (i)(2)(i) and (i)(2)(ii) of this AD:

(i) Use 1/8-inch black lettering on a white background; and

(ii) Install the placard on the instrument panel in close proximity to the A/C selection switch.

(3) Do the steps in paragraphs (i)(3)(i) through (i)(3)(v) of this AD to return the airplane to service with the compressor motor fuse limiter removed.

(i) Install fuse limiter nuts on the terminals and torque to 100 inch-pounds +5 or −5 inch-pounds.

(ii) Install the aft power J-Box cover with the wing nuts.

(iii) Remove the warning tag on the battery and external power receptacle.

(iv) Connect battery connector to battery.

(v) Install aft baggage compartment dividers.

(4) If you choose to deactivate the system and then later choose to return the A/C system to service: Before returning the A/C system to service and removing the placard, you must apply the inspection and replacement requirements of the brushes as specified in paragraph (g) and (h) of this AD.

For the first two A/C compressor motor brush replacement cycles, within 30 days after the replacement or within 30 days after the effective date of this AD, whichever occurs later, send the brushes that were removed to Cessna Aircraft Company, Cessna Service Parts and Programs, 7121 Southwest Boulevard, Wichita, KS 67215. Provide the information in paragraphs (j)(1) through (j)(6) of this AD with the brushes:

(1) The Model and S/N of the airplane;

(2) P/N of motor;

(3) P/N of the brushes, if known;

(4) The elapsed amount of motor hours since the last brush/motor replacement, if known;

(5) If motor hours are unknown, report the elapsed airplane flight hours since the last brush/motor replacement and indicate that motor hours are unknown; and

(6) Number of motor hours currently displayed on the pallet hour meter.