AD 75-09-13

75-09-13 TELEDYNE CONTINENTAL MOTORS: Amendment 39-2178. Applies to the following Teledyne Continental Motors Model engines manufactured prior to August 10, 1973, installed on, but not necessarily limited to Cessna T-310, 320, 340, 401, 402, 411, 414 and 421 series, Rockwell International Model Aero Commander 685 and Beech V35-TC, V35A-TC and V35B-TC series airplanes:

New Engine Remanufactured Engine Engine Model Serial Number Serial Number TSIO-470-B Applies to all S/N's 100080 and below TSIO-470-C Applies to all S/N's 108534 and below TSIO-470-D Applies to all S/N's 138544 and below TSIO-520-B 500018 and below *176191 and below TSIO-520-D 505001 and below *180029 and below TSIO-520-E 502125 and below 182395 and below

GTSIO-520-C 602001 and below 155370 and below GTSIO-520-D 601005 and below 219161 and below GTSIO-520-H *600137 and below 218046 and below GTSIO-520-F 603028 and below 224203 and below

Model Airplane on Airplane Engine Model Which Installed Serial Numbers TSIO-520-J Cessna 414 00489 and below TSIO-520-K Cessna 340 00318 and below

*The following individual engines are not affected by this AD: TSIO-520-B, S/N's 176170, 176185, 176186, 176187; TSIO-520-D, S/N 180028; GTSIO-520-H, S/N 600119. Compliance required within the next 25 hours' time in service after the effective date of this AD, unless already accomplished. (1) To detect cracked turbocharger oil inlet adapters inspect the turbocharger oil inlet adapter located at the turbocharger center housing for cracks and/or oil seepage. If there is evidence of oil leakage or cracks, the adapter must be replaced with steel adapter TCM P/N 640793 or Cessna P/N 5655204-2. When replacing the aluminum adapter with the steel adapter on the following model airplanes, the oil fitting which mates with the turbocharger oil inlet adapter must be replaced, unless already accomplished, with the appropriate steel fitting listedbelow.

Applicable Replacement Make Model Airplane S/N's Steel Fitting Beech V35-TC All AN 816-6 V35A-TC AN 816-6 V35B-TC AN 816-6

Cessna 320-D, -E All MS20823-6 320-F 320F0001 thru MS20823-6 320F0034 401 & 402 0001 thru 0155 MS20823-6

(2) If there is no evidence of cracks or oil seepage, inspect at intervals not to exceed 25 hours' time in service from the last inspection until replaced with turbocharger oil inlet adapter TCM P/N 640793 or Cessna P/N 5655204-2. Replacement of the aluminum adapter TCM P/N 628675 or Cessna P/N 5655204-1 with steel adapter P/N 640793 or Cessna P/N 5655204-2 or an equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region, is required within one year from the effective date of this AD. This amendment becomes effective April 24, 1975.