AD 80-12-13

80-12-13 BRITISH AEROSPACE (formerly Hawker Siddeley, Ltd.): Amendment 39- 3799. Applies to Model DH/BH/HS 125 series airplanes, certificated in all categories, which have incorporated British Aerospace modification 251605 and have any of the following: an AiResearch APU Model GTCP30-92(c) installed as a replacement for AiResearch APU Model GTCP3-92, AiResearch Service Bulletin 30-49-3689 incorporated, or British Aerospace modification 257513, 252502, 256817, 256855, 258015, 258027, or 258037 incorporated.

NOTE: This AD is known to apply, but is not necessarily limited, to the airplanes listed below.

Model Series - all variants Serial Number DH/HS 125 1 25/097 DH/HS 125 3 25/113, 117, 125, 133,

140, 143, 144, 154, 157,

162, 164 thru 168, 172 HS/BH 125 400, 401, 403 25/178, 189, 194, 197,

209, 215, 217, 227, 231,

240, 242, 243, 246 thru 251,

254, 257, 270, 271, 272, 274 HS/BH 125 600 25/256 & 25/6012, 6015,

6017, 6019, 6021, 6024,

6027, 6029, 6030, 6031,

6033, 6035, 6037, 6039,

6041, 6042, 6045, 6048,

6049, 6050, 6052, 6053,

6054, 6056, 6057, 6058,

6059, 6060, 6062, thru 6071 HS 125 700 25/7001, 7007, 7010,

7013, 7020, 7022, 7025,

7028, 7031, NA 0201 0218

Compliance is required as indicated, unless already accomplished.

To prevent failure of the main engine mount beam, accomplish the following:

(a) Within the next 500 hours time in service after the effective date of this AD, modify the main engine mount beam in accordance with Section 2, "Accomplishment Instructions", British Aerospace Service Bulletin 49-28(2675), Rev. 2, dated June 26, 1979, (hereinafter referred to as the Service Bulletin) or an FAA-approved equivalent.

(b) For purposes of this AD, with the exception of cleats equivalent to those specified in the Service Bulletin, an FAA-approved equivalent may be approved by an FAA airworthiness or engineering and manufacturing inspector or the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Office. Any cleats equivalent to those specified in the Service Bulletin must be approved by the Chief, Aircraft Certification Staff, FAA Europe, Africa, and Middle East Office.

(c) Upon request of an operator, the Chief, Aircraft Certification Staff, FAA, Europe, Africa and Middle East Office, c/o American Embassy, Brussels, Belgium, may adjust the compliance time specified in paragraph (a) of this AD or approve a modification equivalent to that specified in the Service Bulletin provided such request is made through an FAA maintenance inspector and the request contains substantiating data to justify the request for that operator.

This amendment becomes effective July 14, 1980.