AD 89-22-16

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AD Number:
89-22-16
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
GARRETT ENGINE DIVISION Models TFE731-2, -5, -5AR, and -5R Engines
Subject:
Engine Acceleration or Deceleration
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
Make:
Honeywell International Inc.
Model:
TFE731-2 | TFE731-5 | TFE731-5AR | TFE731-5R
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 89-22-16
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:  

AD NUMBER:   89-22-16

SUBJECT HEADING:   GARRETT ENGINE DIVISION Models TFE731-2, -5, -5AR, and -5R Engines

ACTION:  

SUMMARY:  

DATES:  

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  

89-22-16 GARRETT ENGINE DIVISION: Priority Letter AD issued on October 26, 1989.
Applicability: Garrett Turbofan Engine Models TFE731-2, -5, -5AR, and -5R, certificated in any category, installed on, but not limited to, the following aircraft: Lear Jet M31, CASA 101, Falcon 900, Falcon 20-5, and BAe 125-800.

Compliance: Required as indicated, unless already accomplished.

To prevent an uncommanded engine acceleration or deceleration, accomplish the following:

(a) Review the engine log book or maintenance records on the previously listed engine models to determine if DEEC Part Number 2118002-6, 2118002-8, 2118002-9, or 2118002-201 with one of the following serial numbers is installed. Spare DEEC's must also be checked for applicable part number and serial number.

DEEC SERIAL NUMBERS



PN 2118002-6		PN 2118002-9		PN 2118002-20
68-1094	108-1159	48-1049	78-1128	58-138
68-1095	108-1160	48-1059	78-1129	58-139
69-1096	108-1161	48-1060	78-1130	58-140
68-1097	108-1162	48-1061	78-1131	58-145
68-1106	108-1163	48-1063	78-1133	58-147
68-1108	108-1164	48-1071	78-1134	58-148
68-1109	108-1166	48-1072	78-1135	58-150
68-1110	108-1167	78-1113	78-1136	108-151
68-1111	108-1168	78-1114	78-1137	108-152
68-1112	108-1169	78-1115	78-1138	108-153
108-1152	108-1170	78-1116	78-1139	108-154
108-1154	108-1171	78-1117	78-1140	108-155
108-1155	108-1172	78-1118	78-1141	108-157
108-1156	108-1173	78-1119	78-1142	108-159
108-1157	108-1174	78-1120	78-1145	108-160
108-1158		78-1121	78-1146	108-162
		78-1122	78-1147	108-164
PN 2118002-8		78-1123	78-1148	108-165
47-778		78-1124	78-1149	108-166
77-861		78-1125	78-1150	108-167
77-862		78-1126	78-1151	108-168
77-873		78-1127		108-169
				108-170
				108-172

(b) Remove from service, if necessary, suspect serial numbered DEEC's listed in paragraph (a) with less than 50 engine hours time since new within the next 25 engine operating hours after receipt of this priority letter AD, and DEEC's with 50 or more engine hours time since new within the next 100 engine operating hours after receipt of this priority letter AD, and replace with a serviceable DEEC.

NOTE: Refer to Garrett Service Bulletin (SB) TFE731-76-3049, dated October 6, 1989, to determine previous accomplishment with this AD, and for removal, installation, repair, and re-identification information for these suspect DEEC's.

(c) Repair and re-identify, before further flight, in accordance with the Garrett SB TFE731-76-3049, dated October 6, 1989, suspect serial numbered DEEC's listed in paragraph (a) installed on a spare engine or located as a spare part.

(d) Revise the applicable FAA Approved Airplane Flight Manual (AFM) to provide interim emergency procedures to flight crews on airplanes affected by paragraphs (a) and (b), within 10 calendar days after receipt of this priority letter AD, by adding the following:

EMERGENCY PROCEDURES
In the event that uncommanded engine acceleration or deceleration is experienced:
(1) Place power lever for the affected engine in an intermediate position (slightly aft of cruise).
(2) Select computer OFF on affected engine (remove electrical power to DEEC).
(3) Re-adjust power lever as necessary.
(4) Continue with affected computer OFF for the remainder of the flight.

NOTE: It is also possible that the DEEC malfunction may affect the reserve power function on engines so equipped; therefore, it is important to conduct the normal reserve power pre-flight check prior to flights during which reserve power may be used.

(e) A copy of this AD inserted in the FAA Approved AFM may be considered an acceptable means of compliance with the required AFM revision.

(f) Aircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished.

(g) Upon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, an alternate method of compliance with the requirements of this priority letter AD or adjustments to the compliance schedule specified in this priority letter AD may be approved by the Manager, Los Angeles Aircraft Certification Office, Transport Airplane Directorate, Aircraft Certification Service, Federal Aviation Administration, 3229 East Spring Street, Long Beach, California 90806-2425.

(h) Documents pertinent to this priority letter AD may be obtained, upon request, from Garrett General Aviation Services Division, Distribution Center, 2340 East University, Phoenix, Arizona 85037; telephone (602) 255-2548, or may be examined at the office of the Assistant Chief Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Burlington, Massachusetts 01803, Rules Docket No. 89-ANE-42.

Priority Letter AD 89-22-16, issued on October 26, 1989, becomes effective immediately upon receipt.

FOOTER: