Airworthiness Directive · Amendment 39-11891 · Allison Engine Company AE 3007A and 3007C Series Turbofan Engines
Allison Engine Company AE 3007A and 3007C Series Turbofan Engines
This AD is applicable to Allison Engine Company Models AE 3007A, AE 3007A1/1, AE 3007A1/2, AE 3007A1, AE 3007A1/3, AE 3007A1P, AE 3007A3, and AE 3007C turbofan engines with full authority digital electronic controls (FADEC's) that have the following hardware serial numbers (SN's) installed:
| Engine model | FADEC hardware SN |
|---|---|
| AE 3007C | BX55758, BX55760, BX55761, BX55763 through BX55765, BX55767, and BX61001 through BX61069, unless the FADEC has been repaired and marked as provided in paragraphs (f) and (g) of this AD. |
| AE 3007A, AE 3007A1/1, AE 3007A1/2, AE3007A1/3, AE 3007A1, AE 3007A1P, AE 3007A3 | BX56348, BX56361 through BX56364, BX56374, BX56376, BX56392 through BX56395, BX59006, BX59007, BX59013, BX59014, BX59041, BX59050, BX59062, BX59064 through BX59066, BX59075 through BX59078, BX60000 through BX60145, BX60172 through BX60239, BX60265 through BX60287, BX60301, BX60303, BX60311, BX60381 through BX60384, unless the FADEC has been repaired and marked as provided in paragraphs (f) and (g) of this AD. |
These engines are installed on, but not limited to Embraer Model EMB-145, EMB-145ER, EMB-145MR, EMB-145LR, EMB-135ER, EMB-135LR, and Cessna 750 airplanes.
Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (h) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), that is applicable to Allison Engine Company AE 3007A and AE 3007C series turbofan engines with certain full authority digital electronic controls (FADEC's), listed by hardware serial number (SN), installed. This action requires inspections of installed FADEC's before further flight to be sure that no more than one engine with suspect FADEC's is installed on the same airplane, and eventual replacement of all of the suspect FADEC's with serviceable FADEC's. This amendment is prompted by reports of uncommanded in-flight shutdowns of engines. The actions specified in this AD are intended to prevent an uncommanded in-flight engine shutdown and the potential for an in-flight dual-engine shutdown caused by a potential hardware failure mode in some AE 3007 series FADEC's.
To prevent an uncommanded in-flight engine shutdown and the potential for an in-flight dual-engine shutdown, do the following:
(a) Before further flight, inspect the FADEC for a SN that is listed in “Applicability” of this AD to be sure that no airplane has more than one engine with FADEC's that have suspect hardware SN's. The engine may have two FADEC's that have suspect hardware SN's.
(b) If more than one engine per airplane is found with a FADEC that has a suspect hardware SN, remove the FADEC so there is only one engine per airplane with a FADEC that has a suspect hardware SN.
(c) Removed suspect FADEC's may be returned to local stock.
(d) The suspect FADEC's may be installed on another airplane as long as the requirements of paragraphs (a) and (e) of this AD are met.
(e) Replace all FADEC's that have suspect hardware SN's with serviceable FADEC's within 3 months after the effective date of this AD.
(f) After 3 months from the effective date of this AD, do not install a FADEC that has a hardware SN listed in “Applicability” of this AD on any engine unless the FADEC hardware has been repaired and the modification tag on the FADEC is marked with TR1 day/month. For example, a repair that was accomplished on September 25, 2000, will show as TR1 25/09.
(g) For the purpose of this AD, a serviceable FADEC is a FADEC that does not have a hardware SN listed in “Applicability” of this AD, unless the FADEC with the suspect hardware SN has been modified using Rolls-Royce (RR) service bulletin (SB) AE 3007A-73-042, Revision 1, dated August 23, 2000; or RR SB AE 3007C-73-024, Revision 1, dated August 23, 2000.
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.
