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Airworthiness directives › 2017-09-04

AD 2017-09-04 Airworthiness Directives; The Boeing Company Airplanes

2017-06-08
2017-05-04
39-18866
FAA-2016-9570
Airframe
—

Models named: 707-100 Long Body, -200, -100B Long Body, -100B Short Body series, 707-300, -300B, -300C, -400 series, 720, 720B series. Read the applicability below — it usually turns on serial or part numbers too.

Applicability*9

This AD applies to the airplanes, certificated in any category, as identified in Boeing 707 Alert Service Bulletin A3543, dated September 15, 2016, and in paragraphs (c)(1) and (c)(2) of this AD. (1) The Boeing Company Model 707-100 Long Body, -200, -100B Long Body, and -100B Short Body series airplanes; and Model 707-300, -300B, -300C, and -400 series airplanes. (2) The Boeing Company Model 720 and 720B series airplanes.

Compliance

Comply with this AD within the compliance times specified, unless already done.

Required actions

At the applicable time specified in paragraph 1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3543, dated September 15, 2016, except as required by paragraph (h)(1) of this AD: Do all applicable actions specified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD, in accordance with the Accomplishment Instructions of Boeing 707 Alert Service Bulletin A3543, dated September 15, 2016, except as required by paragraph (h)(2) of this AD. (1) Do a detailed inspection of the station 1440 aft pressure bulkhead web for any oil canning. Repeat the inspection at the applicable time specified in paragraph 1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3543, dated September 15, 2016. (2) Do all applicable related investigative actions, including detailed, eddy current, and high frequency eddy current (HFEC) inspections. Repeat the applicable inspections thereafter at the applicable time specified in paragraph 1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3543, dated September 15, 2016. (3) Do all applicable corrective actions at the applicable time specified in paragraph 1.E., “Compliance,” of Boeing 707 Alert Service Bulletin A3543, dated September 15, 2016.

Unsafe condition

This AD was prompted by a determination that undetected web fatigue cracking caused by oil canning may exist in the station 1440 aft pressure bulkhead web. We are issuing this AD to detect and correct fatigue cracking of the aft pressure bulkhead web, which could grow in length and ultimately reduce the structural integrity of the web and lead to rapid decompression of the airplane.

Affected ADs

None.

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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1