Airworthiness Directive · Amendment 39-18339 · Doors
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 757-200, 757-200CB, and 757-200PF airplanes; certificated in any category; as identified in Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 757-200, 757-200CB, and 757-200PF airplanes. This AD was prompted by a report that a forward-most cam latch of the forward center cam latch pair on a main cargo door (MCD) broke during flight. This AD requires doing a general visual inspection for broken or missing cam latches, latch pins, and latch pin cross bolts; torqueing the cross bolts in the latch pins; measuring the extension of the latch pins; replacing all alloy steel cross bolts through the latch pins with corrosion resistant steel (CRES) cross bolts; doing a general visual inspection of all cam latches for lip deformation; doing an inspection of cam latch 1 and cam latch 2 for cracks and replacing all cracked or broken parts; checking the rig of the MCD and re-rigging as applicable; and doing related investigative and corrective actions, if necessary. This AD also requires doing certain repetitive inspections until MCD rigging is done. This AD also requires repetitive MCD post- rigging inspections and corrective actions if necessary. We are issuing this AD to detect and correct discrepancies of the cam latches, latch pins, and latch pin cross bolts, which could reduce the structural integrity of the MCD, and result in potential loss of the cargo door and rapid decompression of the airplane.
At the applicable times specified in table 1 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014, except as provided by paragraph (j)(1) of this AD: Do a general visual inspection for broken or missing cam latches, latch pins, and latch pin cross bolts; torque the cross bolts in the latch pins; measure the extension of the latch pins; replace all alloy steel cross bolts through the latch pins with corrosion resistant steel (CRES) cross bolts; do a general visual inspection of all cam latches for lip deformation; do a high frequency eddy current (HFEC) or magnetic particle inspection of cam latch 1 and cam latch 2 for cracks and replace all cracked or broken parts; check the rig of the MCD and re-rig as applicable; and do all applicable related investigative and corrective actions; and thereafter do all applicable repetitive inspections specified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014, except as required by paragraph (j)(2) of this AD. Do all applicable related investigative and corrective actions at the applicable time specified in table 1 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014. Do all applicable repetitive inspections at the applicable time and intervals specified in table 1 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014, until the rig of the MCD has been checked in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014.
(1) For Condition 2 as defined in Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014: Do repetitive general visual inspections for broken or missing cam latches, latch pins, and latch pin cross bolts.
(2) For Condition 3 as defined in Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014: Repetitive general visual inspections for broken or missing cam latches, latch pins, and latch pin cross bolts and repetitive detailed inspections of the discrepant cam latch and mating latch pin for any cracks, or gouges in critical areas.
(3) For Condition 4 as defined in Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014: Repetitive general visual inspections for broken or missing cam latches, latch pins, and latch pin cross bolts; repetitive detailed inspections of the cam latches and latch pins for any cracks, or any gouges in critical areas; and, unless replaced with new or reworked parts, repetitive HFEC or magnetic particle inspections of cam latch 1 and cam latch 2 for any cracks.
At the applicable times specified in table 2 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014: Do general visual inspections for any broken or missing cam latches, latch pins, and latch pin cross bolts; a detailed inspection of the cam latches and latch pins for any cracks, or any gouges in critical areas; and an HFEC or magnetic particle inspection of cam latch 1 and cam latch 2 for cracks; and do all applicable corrective actions, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014; except as required by paragraph (j)(2) of this AD. Do all applicable corrective actions before further flight. Repeat the inspections thereafter at the applicable times specified in table 2 of paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 757-52A0091, Revision 1, dated December 19, 2014.
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.
Aircraft
