AD 78-07-01

78-07-01 CESSNA: Amendment 39-3163. Applies to TP206 (Serial Numbers P206-0191 thru P20600647), TU206 (Serial Numbers U206-0487 thru U20603693), T207 (Serial Numbers 20700001 thru 20700378) and T210 (Serial Numbers T210-0001 thru T210-0454 and Serial Numbers 21059200 thru 21061758) series airplanes certificated in all categories.

To preclude engine oil pump failure due to contamination by the turbocharger thrust bearing anti-rotation pins and failure of the turbocharger shaft, within the next 25 hours' time-in-service after the effective date of this AD, accomplish the following:

A. Check the turbocharger nameplate or aircraft permanent maintenance records to determine if the turbocharger serial number is prefixed by any of the following letter combinations:

EF EFR FA FAR FH FHR EG EGR FB FBR FI FIR EH EHR FC FCR FJ FJR EI EIR FD FDR FK FKR EJ EJR FE FER FL FLR EK EKR FF FFR GA GAR EL ELR FG FGR GB GBR

B. If the serial number on the turbocharger nameplate is not prefixed by any of the letter combinations set forth in Paragraph A, make an entry in the aircraft permanent maintenance records indicating this finding and no further action is required.

C. If the serial number on the turbocharger nameplate is prefixed by any of the letter combinations set forth in Paragraph A, check the aircraft permanent maintenance records to determine whether, when complying with AD 77-06-02, the turbocharger center housing was replaced by a mechanic or repair agency in accordance with Cessna Service Kit SK 210-75, dated February 24, 1977 (Reference Cessna Service Letter SE 77-3, Supplement #2 dated February 24, 1977) or by the turbocharger manufacturer (AiResearch).

D. If the turbocharger center housing was replaced by AiResearch, make an entry in the aircraft permanent maintenance records indicating this finding and no further action is required.

E. If the turbocharger center housing was replaced by a mechanic or repair agency using instructions in Cessna Service Kit SK 210-75, visually inspect the turbocharger for signs of damage and proper compressor wheel attachment in accordance with Cessna Service Kit SK 210-78 dated November 15, 1977, or later revision (Ref. Cessna Service Letter SE 77-42 dated December 2, 1977, or later revisions) for damage which may have resulted from incomplete compressor wheel locknut torquing procedures prescribed in Cessna Service Kit SK 210-75.

(1) If visual signs of damage are evident, return the turbocharger to AiResearch in accordance with Cessna Service Kit SK 210-78.

(2) If no visual signs of damage are present but the compressor wheel attachment does not meet the criteria set forth in Cessna Service Kit SK 210-78, conduct additional inspections prescribed therein. Units found acceptable as a result of this inspection may be returned to service after reassembly per this kit. Return unacceptable units to AiResearch in accordance with instructions in Cessna Service Kit SK 210-78.

(3) If no visual signs of damage are found and the compressor wheel attachment meets the criteria set forth in Cessna Service Kit SK 210-78, reassemble and identify the turbocharger in accordance with Cessna Service Kit SK 210-78.

F. If the turbocharger center housing has not been replaced in accordance with AD 77-06-02, replace the turbocharger center housing in accordance with Cessna Service Kit SK 210-75B dated October 27, 1977, or later revision incorporating a compressor wheel seating procedure. (Ref. Cessna Service Letter SE 77-42.)

G. Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished.

H. Any equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, FAA, Central Region.

This amendment supersedes Amendment 39-2853 (42 FR 15894), AD 77-06-02.

This amendment becomes effective April 6, 1978.