# AD 91-25-11: Rudder Trim Tab System

- Type: Airworthiness directive
- Status: Current
- Products: Embraer EMB-110P1 and EMB-110P2
- Effective: February 10, 1992
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small/large airplane
- Amendment: 39-8167
- Docket: 91-CE-92-AD
- Registered aircraft: 13 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F97EA5800D51AD6C86256A23006F0505.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/91-25-11

## The airworthiness directive

91-25-11 EMBRAER (EMPRESA BRASILEIRA de AERONAUTICA, S.A.): Amendment 39-8167. Docket No. 91-CE-92-AD. Applicability: EMB-110 Series airplanes (all serial numbers), certificated in any category.

Compliance: Required within the next 10 hours time-in-service after receipt of this AD, unless already accomplished.

To prevent severe vibration, flutter, and loss of control of the airplane caused by incorrect installation of the rudder trim tab system, accomplish the following:

  (a) Visually inspect the rudder trim tab system for correct assembly in accordance with the instructions in EMBRAER Service Bulletin (SB) No. 110-27-0091, dated December 5, 1991.

  (1) If determined to be correctly installed in accordance with the criteria specified in EMBRAER SB No. 110-27-0091, return the airplane to service.

  (2) If determined to be incorrectly installed in accordance with the criteria specified in EMBRAER SB No. 110-27-0091, reinstall the rudder trim tab system in accordance with the instructions in EMBRAER SB No. 110-27-0091.

  (b) Special flight permits may be issued in accordance with FAR 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 initial or repetitive compliance times that provides an equivalent level of safety may be approved by the Manager, Atlanta Aircraft Certification Office, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta Aircraft Certification Office.

  (d) The inspection and possible reinstallation required by this AD shall be done in accordance with EMBRAER Service Bulletin (SB) No. 110-27-0091, dated December 5, 1991. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from EMBRAER, P.O. Box 343-CE, 12.200 Sao Jose dos Campos, Sao Paulo, Brazil; or EMBRAER Aircraft Corporation, 276 SW 34th Street, Fort Lauderdale, Florida 33315. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 1100 L Street, NW, Room 8401, Washington, DC.

  (e) This amendment (39-8167, AD 91-25-11) becomes effective on February 10, 1992, as to all persons except those persons to whom it was made immediately effective by priority letter AD 91-25-11, issued 12/6/91, which contained this amendment.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A21SO](https://openairdocs.org/tcds/A21SO): Embraer S.A.; names 2 of 2 models: EMB-110P1, EMB-110P2

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 13 (13 by airframe model, 0 by engine model)
- Makers: Embraer 13

Models with the most aircraft:

- [Embraer EMB-110P1](https://openairdocs.org/model/embraer-emb-110p1): 13 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/91-25-11/models.md
Every aircraft: https://openairdocs.org/ad/91-25-11/aircraft.md

Its text cites no advisory circulars or STCs.

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