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| UNAPPROVED PARTS\                                   |   | ![](me      |
| NOTIFICATION                                        |   | dia/image1. |
|                                                     |   | png){width= |
| SUSPECTED UNAPPROVED PARTS PROGRAM OFFICE, AVS-20   |   | "0.72986111 |
|                                                     |   | 11111111in" |
| 13873 PARK CENTER ROAD, SUITE 165                   |   | height="    |
|                                                     |   | 0.741666666 |
| HERNDON, VA 20171                                   |   | 6666667in"} |
|                                                     |   |             |
|                                                     |   | U.S.        |
|                                                     |   | Department  |
|                                                     |   |             |
|                                                     |   | of          |
|                                                     |   | Tra         |
|                                                     |   | nsportation |
|                                                     |   |             |
|                                                     |   | **Federal   |
|                                                     |   | Aviation**  |
|                                                     |   |             |
|                                                     |   | **Admin     |
|                                                     |   | istration** |
|                                                     |   |             |
|                                                     |   | *No.        |
|                                                     |   | 2006-00136* |
|                                                     |   |             |
|                                                     |   | *December   |
|                                                     |   | 8, 2006*    |
+-----------------------------------------------------+---+-------------+

***http://www.faa.gov/aircraft/safety/programs/sups/upn/***

**AFFECTED PARTS**

Reciprocating aircraft engine crankcases.

**PURPOSE**

The purpose of this notification is to advise all aircraft owners,
operators, manufacturers, maintenance organizations, and parts suppliers
and distributors regarding improper maintenance performed on
reciprocating engine crankcases.

**BACKGROUND**

Information received during a Federal Aviation Administration (FAA)
suspected unapproved parts investigation revealed that between November
2003 and March 2006, Crankcase Services USA, Ltd. (Crankcase), located
at 2133-2 North Sheridan Rd., Tulsa, OK 74115, improperly maintained and
approved for return to service reciprocating engine crankcases.
Crankcase holds Air Agency Certificate No. UMRR730X and is authorized to
perform maintenance using an approved welding process to repair
reciprocating engine crankcases.

Discrepancies noted in Crankcase practices included, but are not limited
to, the following:

-   Failing to ensure that all test and inspection instruments used to
    make airworthiness determinations are calibrated to a standard
    acceptable to the FAA. Crankcase used torque wrenches, digital depth
    micrometers, and dial indicators that exceeded the time allotted for
    recalibration by approximately two years.

-   Failing to maintain required record keeping in accordance with their
    repair station manual.

-   Approving articles for return to service without holding current FAA
    Repairman Certificates.

Below is a *partial* list of parts improperly approved for return to
service by Crankcase.

> **PARTIAL LIST OF PARTS**

  ----------------------- -------------------------- ---------------------
  **PART NUMBER**         **SERIAL NUMBER**          **DATE**

                                                     

  IO360                   5075                       Jan. 23, 2006

  GO480                   1040                       Jan. 30, 2006

  0470                    136                        Feb. 1, 2006

  IO520                   9A778S                     Feb. 3, 2006

  0360                    4278                       Feb. 7, 2006

  0320                    6976                       Feb. 7, 2006

  0470                    9B105S                     Feb. 7, 2006

  IO550                   GO60009R                   Feb. 8, 2006

  IO0550                  9B69PL                     Feb. 15, 2006

  0320                    7741                       Feb. 15, 2006

  0320                    975                        Feb. 15, 2006

  0200                    39                         Feb. 16, 2006

  0540                    524                        Feb. 22, 2006

  TSI0520                 F28940RPL                  Feb. 22, 2006

  IO520                   B159501R                   Feb. 22, 2006

  IO320                   2156                       Feb. 23, 2006

  IO320                   687                        Feb. 23, 2006

  0360                    367                        Mar. 3, 2006
  ----------------------- -------------------------- ---------------------

**RECOMMENDATIONS**

Regulations require that type-certificated products conform to their
type design. Aircraft owners, operators, manufacturers, maintenance
organizations, and parts suppliers and distributors should inspect their
aircraft, aircraft records, and/or parts inventories for any crankcase
halves approved for return to service by Crankcase. If these parts are
found installed on aircraft, appropriate action should be taken. If any
crankcase halves approved for return to service by Crankcase are found
in existing inventory, it is recommended that they be segregated to
prevent installation until their eligibility for installation is
determined.

**FURTHER INFORMATION**

Further information concerning this investigation, and guidance
regarding the above-referenced crankcase halves, may be obtained from
the FAA Flight Standards District Office (FSDO) given below. The FAA
would appreciate any information concerning the discovery of the
above-referenced crankcases from any source, the means used to identify
the source, and the actions taken to remove the crankcases from aircraft
and/or stock.

This notice originated from the FAA Oklahoma City FSDO, 1300 S.
Meridian, Suite 601, Oklahoma City, OK 73108, telephone (405) 951-4200,
fax (405) 951-4282; and was published through the FAA Suspected
Unapproved Parts Program Office, AVS-20, telephone (703) 668-3720, fax
(703) 481-3002.