AD 95-24-10 ACTIVE

95-24-10 MICHELIN AIRCRAFT TIRE CORPORATION: Priority Letter issued on November 21, 1995. Docket No. 95-CE-88-AD.

Applicability: Part number (P/N) 028-520-1 (22x5.75-12/10PR) tires with the following serial numbers that are installed on the main landing gear of, but not limited to, Cessna Model 650 (Citation III, VI, and VII) airplanes that are certificated in any category:

Serial Nos.
Serial Nos.
Serial Nos.
Serial Nos.

4279N00339
4279N00340
4279N00341
4279N00342
4279N00343
4279N00597
4279N00598
4279N00599
4279N00600
4279N00601
4280N00075
4280N00199
4280N00200
4280N00201
4280N00203
4280N00204
4280N00205
4280N00206
4280N00360
4280N00361
4282N00352
4283N00099
4283N00100
4283N00101
4283N00102
4283N00200
4283N00201
4283N00202
4283N00453
4283N00454
4283N00455
4283N00456
4284N00612
4284N00613
4284N00614
4284N00615
4284N00616
4285N00100
4285N00101
4285N00102
4285N00103
4285N00104
4285N00105
4285N00106
4285N00107
4285N00108
4285N00347
4285N00348
4285N00349
4285N00353
4285N00354
4285N00355
4285N00356
4285N00608
4285N00609
4286N00103
4286N00104
4286N00105
4286N00106
4286N00442
4286N00443
4286N00444
4286N00445
4286N00446
4286N00447
4286N00448
4286N00449
4286N00450
4286N00600
4286N00601
4286N00602
4286N00603
4286N00604
4286N00605
4286N00606
4286N00608
4286N00609
4287N00088
4287N00089
4287N00090
4287N00091
4287N00092
4287N00093
4287N00094
4287N00095
4287N00096
4287N00097
4287N00357
4287N00358
4287N00359
4287N00360
4287N00361
4287N00362
4287N00363
4287N00364
4288N00118
4288N00119
4288N00120
4288N00121
4288N00302
4288N00303
4288N00304
4288N00305
4288N00306
4288N00307
4290N00111
4290N00113
4290N00114
4290N00115
4290N00116
4290N00117
4290N00355
4290N00356
4290N00606
4290N00607
4290N00608
4290N00609
4290N00610
4290N00611
4290N00612
4291N00082
4291N00083
4291N00084
4291N00085
4291N00086
4291N00087
4291N00088
4291N00089
4291N000914291N00273
4291N00274
4291N00275
4291N00276
4291N00277
4291N00278
4291N00620
4291N00621

NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Compliance: Required prior to further flight after receipt of this AD and thereafter upon installation of one of the affected tires, unless already accomplished.

To prevent loss of control of the airplane during landing operations because of P/N 028-520-1 (22x5.75-12/10PR) tire failure, accomplish the following:

(a) Replace any of the affected P/N 028-520-1 (22x5.75-12/10PR) tires with an FAA-approved tire.

(b) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished.

(c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Atlanta Aircraft Certification Office (ACO), Campus Building, 1701 Columbia Avenue, suite 2-160, College Park, Georgia 30337-2748. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta ACO.

NOTE 2: Information concerning the existence ofapproved alternative methods of compliance with this AD, if any, may be obtained from the Atlanta ACO.

(d) Copies of the applicable service information may be obtained from Michelin Aircraft Tire Corporation, 9700 Research Drive, Charlotte, North Carolina. This information may also be examined at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

(e) Priority Letter AD 95-24-10, issued November 21, 1995, becomes effective immediately upon receipt.

The FAA has received two reports of failure (rupture) of the main landing gear tire during landing operations on Cessna Citation VII airplanes. Analysis of these incidents revealed the following:

- the tires, P/N 028-520-1 (22x5.75-12/10PR), were manufactured by the Michelin Aircraft Tire Corporation (FAA Manufacturing Approval: TSO-C62c);

- the cause of the failure is attributed to separations that developed in the crown region of the tire with the rubber component below the tread reinforcing plies;

- the separations are attributed to low adhesion caused by a misplaced rubber compound; and

- a check of the company records reveals that a total of 137 tires were manufactured in this lot and could contain this same low adhesion problem.

The P/N 028-520-1 (22x5.75-12/10PR) tires are predominantly installed in Cessna Model 650 (Citation III, VI, and VII) airplanes; however, they could be installed on other airplanes.

After reviewing and examining all available information to the incidents received above, the FAA has determined that (1) the remaining 135 tires manufactured in the lot that could have a possible low adhesion problem should be removed from service; and (2) AD action should be taken to prevent loss of control of the airplane during landing operations because of Michelin Aircraft Tire Corporation P/N 028-520-1 (22x5.75-12/10PR) tire failure.

Since an unsafe condition has been identified that is likely to exist or develop on airplanes that are equipped with at least one Michelin Aircraft Tire Corporation P/N 028-520-1 (22x5.75-12/10PR) tire (serial numbers referenced in the actual AD of this priority letter) installed on the main landing gear, this AD requires replacing any of the affected tires with an FAA-approved tire.

This rule is issued under 49 U.S.C. Section 44701 (formerly section 601 of the Federal Aviation Act of 1958), pursuant to the authority delegated to me by the Administrator, and is effective immediately uponreceipt of this priority letter.

Ms. Denise Bosonetto, Aerospace Engineer, FAA, Atlanta Aircraft Certification Office, Campus Building, 1701 Columbia Avenue, suite 2-160, College Park, Georgia 30337-2748; telephone (404) 305-7379; facsimile (404) 305-7348.