# SAIB CE-04-66: 

- Type: Special airworthiness information bulletin (advisory, not mandatory)
- Status: Current
- Revision: 0
- Issued: April 29, 2004
- Products: Mooney M20
- Product type: Aircraft, Small Airplane
- PDF: https://openairdocs.org/files/sha256/1b/2d/1b2d6fb989b5cb07ea61e8becb06d54b5d3f8ec8eb1eccd0554116a49decdc0c
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0876CC722D382D218625721F0052EB55.0001
- Page: https://openairdocs.org/saib/CE-04-66

## Text

**SPECIAL**

**AIRWORTHINESS**

**INFORMATION**

**BULLETIN**

Aircraft Certification Service Washington, DC

U.S. Department of Transportation Federal Aviation Administration

CE-04-66 April 29, 2004 www.faa.gov/certification/aircraft This is information only. Recommendations aren’t mandatory.

Introduction:

This Special Airworthiness Information Bulletin alerts you, owners and operators of Mooney Aircraft Company Model M20 airplanes (year model 1966 through 1978) with Dukes Part No. 1057-00-5, -5E, -5F, -5G, of possible premature failure of the landing gear actuators.

Background:

Mooney issued Service Bulletin (SB) 20-190 to provide maintenance and gear replacement procedures for the Mooney landing gear with the Dukes P/N 4196-00-1C or International Telephone and Telegram (ITT) P/N LA11C2110 actuators only. We issued AD 75-23-04, applicable to all M20 series airplanes equipped with Mooney Electric Gear System, Dukes P/N 4196-00-1C, and referenced the procedures in SB 20-190. A later revision of SB 20-190 included the ITT P/N LA11C2110 landing actuator.

We have received several Service Difficulty Reports (Maintenance or Malfunction Defects) regarding the premature failures of the Dukes P/N 1057-00-5, -5E, -5F, and -5G. We determined that some operators were inappropriately maintaining these products with the wrong service instructions (SB 20-190) creating the premature failure of the landing gear actuator. This could prevent the landing gear from functioning properly and could result in a gear-up landing situation.

M20 airplanes with the Dukes 4196-00-1C and the ITT LA11C2110 actuators have a 20:1 speed ratio, made possible with a double lead worm shaft, and the Dukes 1057-00-5 actuator uses a 40:1 speed ratio, made possible with a single lead worm shaft.

Recommendation:

To prevent premature failure of the landing gear actuators, we strongly recommend that owners and operators of the M20 airplanes referenced above stop using SB 20-190 to perform maintenance of these actuators. You should consult the appropriate M20 Service and Maintenance Manual.

For Further Information Contact:

Mr. Garry D. Sills, Aerospace Engineer, FAA Fort Worth ACO, 2601 Meacham Blvd, ASW-150, Fort Worth, TX 76137-4298; phone: (817) 222-5154; fax: (817) 222-5960; e-mail:

garry.d.sills@faa.gov.

## Registered aircraft it may concern (OpenAirDocs)

Registry models matched by make and model, the same way as ADs, most registered aircraft first.

- [Mooney M20](https://openairdocs.org/model/mooney-m20): 23 registered aircraft (airframe model)
- [Aerostar Acft Corp Of Texas M20](https://openairdocs.org/model/aerostar-acft-corp-of-texas-m20): 0 registered aircraft (airframe model)

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