Airworthiness Directive · Amendment 39-15167 · Mitsubishi Heavy Industries MU-2B Series Airplanes
Mitsubishi Heavy Industries MU-2B Series Airplanes
This AD applies to the following airplane models and serial numbers that are certificated in any category:
(1) Category 1 Airplanes (TCDS A2PC):
| Model | Serial Nos. |
|---|---|
| (i) MU-2B, MU-2B-10, MU-2B-15, MU-2B-20, MU-2B-25, and MU-2B-26 | 008 through 347 (except 313 and 321). |
| (ii) MU-2B-30, MU-2B-35, and MU-2B-36 | 501 through 696 (except 652 and 661). |
(2) Category 2 Airplanes (TCDS A10SW):
| Model | Serial Nos. |
|---|---|
| (i) MU-2B-25, MU-2B-26, MU-2B-26A, and MU-2B-40 | 313SA, 321SA, 348SA through 459SA. |
| (ii) MU-2B-35, MU-2B-36, MU-2B-36A, and MU-2B-60 | 652SA, 661SA and 697SA through 1569SA. |
We are adopting a new airworthiness directive (AD) to supersede 93-07-11 and AD 94-04-16, which apply to certain Mitsubishi Heavy Industries MU-2B series airplanes. AD 93-07-11 and AD 94-04-16 currently require you to reduce the maximum deflection of the elevator nose-down trim to a 1-degree to 3-degree range. When the above AD actions were issued, there was no associated elevator trim indicator change. Without such change, the trim reaches the maximum nose-down limit and the indicator still shows additional nose-down trim available. In attempting to force additional nose-down trim, pilots have manually jammed the trim system preventing subsequent electric trim changes until the pilot manually freed the trim wheel. Consequently, this AD retains the actions from AD 93-07-11 and AD 94- 04-16 and adds the action of modifying the elevator trim indicator scale dial to be consistent with the reduced elevator trim capability. We are issuing this AD to prevent the above scenarios from occurring with consequent loss of control.
To address this problem, you must do the following, unless already done:
| Actions | Compliance | Procedures |
|---|---|---|
| (1) Reduce the maximum deflection of the elevator nose-down trim to a 1-degree to 3-degree range | (i) For Category 1 airplanes: Within the next 100 hours time-in-service (TIS) after April 11, 1994 (the effective date of AD 94-04-16) | (A) For Category 1 airplanes: Follow Mitsubishi Heavy Industries, Ltd., Service Bulletin No. 216, dated September 11, 1992. |
| (ii) For Category 2 airplanes: Within the next 100 hours TIS after June 1, 1993 (the effective date of AD 93-07-11) | (B) For Category 2 airplanes: Follow Mitsubishi Heavy Industries, Ltd., Service Bulletin No. 079/27-010, dated August 28, 1992. | |
| (2) Modify the elevator trim indicator scale dial | Within the next 100 hours TIS after September 25, 2007 (the effective date of this AD) | (i) For Category 1 airplanes: Follow Mitsubishi Heavy Industries, Ltd., Service Bulletin No. 228, dated July 13, 1998. (ii) For Category 2 airplanes: Follow Mitsubishi Heavy Industries, Ltd., Service Bulletin No. 091/27-011, dated August 6, 1998. |
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
