Airworthiness Directive · Amendment 39-14008 · Boeing Model 727 Airplanes
Boeing Model 727 Airplanes
This AD applies to Boeing Model 727, 727C, 727-100, -100C, -200, and -200F series airplanes, line numbers 1 through 1832 inclusive; certificated in any category.
The FAA is superseding an existing airworthiness directive (AD), which applies to certain Boeing Model 727 airplanes. That AD currently requires repetitive detailed inspections to detect cracking, corrosion, and existing stop-drilled repairs of cracking in the upper chord of the rear spar of the wing; and repair if necessary. This new AD requires new repetitive inspections to detect cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracks in the upper and lower chords of the front and rear spars of the wing; and repair if necessary. This AD is prompted by our determination that further rulemaking action is necessary to require additional actions specified in the referenced service bulletin. We are issuing this AD to prevent structural failure of the wing and fuel leaks in the airplane due to stress corrosion cracking of the wing spar chords.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
The term “the service bulletin,” as used in this AD, means Boeing Alert Service Bulletin 727-57A0145, Revision 2, dated October 24, 2002.
For airplanes specified as “Group 1” airplanes in the service bulletin: Within 20 years after the date of manufacture or within 90 days after December 18, 2002 (the effective date of AD 2002-24-05, amendment 39-12970), whichever occurs later, perform an external detailed inspection for cracking, corrosion, and existing stop-drilled repairs of cracking in the upper chord on the rear spar from Wing Butt Line (WBL) 70.5 through WBL 249.3, per the service bulletin, paragraph 3.B, “Work Instructions,” Part 1. Thereafter, repeat the inspection at intervals not to exceed 2 years.
Note 1: For the purposes of this AD, a detailed inspection is “an intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
Accomplish the applicable inspection(s) specified in paragraphs (h)(1) through (h)(7) of this AD at the later of the applicable times specified in the “Threshold” and “Grace Period” columns in Table 1 of this AD, and repeat the inspection(s) at the time specified in the “Repetitive Interval” column of Table 1 of this AD. Accomplishment of the inspection required by paragraph (h)(1) of this AD terminates the repetitive inspection requirements of paragraph (g) of this AD.
| For airplanes identified in the service bulletin as— | Threshold— | Grace period— | Repetitive interval— | Do— |
|---|---|---|---|---|
| (1) Group 1 | Before 20 years since the date of issuance of the original Airworthiness Certificate or the date of issuance of the original Export Certificate of Airworthiness | Within 1 year after the effective date of this AD | None | A high frequency eddy current (HFEC) inspection and detailed inspection of the upper chord the rear spar from WBL 70.5 to the wing tip for cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracking, in accordance with paragraph 3.B., Work Instructions, Part 2, of the Accomplishment Instructions of the service bulletin. |
| (2) Group 1 | Before 20 years since the date of issuance of the original Airworthiness Certificate or the date of issuance of the Original Export Certificate of Airworthiness | Within 2 years after the effective date of this AD | At intervals not to exceed 2 years | A detailed inspection of the upper and lower chord of the front spar and the lower chord of the rear spar from WBL 70.5 to the wing tip for cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracking (initial inspection only), in accordance with paragraph 3.B., Work Instructions, Part 3, of the Accomplishment Instructions of the service bulletin. |
| (3) Group 1 | Before 20 years since the date of issuance of the original Airworthiness Certificate or the date of issuance of the original Export Certificate of Airworthiness | Within 4 years after the effective date of this AD | At intervals not to exceed 4 years | An HFEC inspection of the upper and lower chords of the rear spar from WBL 70.5 to the wing tip for cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracking (initial inspection only), in accordance with paragraph 3.B., Work Instructions, Part 4, of the Accomplishment Instructions of the service bulletin. |
| (4) Group 1 | Within 2 years after doing the actions required by paragraph (h)(1) of this AD | None | At intervals not to exceed 2 years | A detailed inspection of the upper chord of the rear spar WBL 70.5 to the wing tip for cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracking (initial inspection only), in accordance with paragraph 3.B., Work Instructions, Part 8, of the Accomplishment Instructions of the service bulletin. |
| (5) Group 1 | Within 4 years after doing the actions required by paragraph (h)(1) of this AD | None | At intervals not to exceed 4 years | An HFEC inspection of doing the not to the upper chord actions exceed 4 of the rear spar required by years from WBL 70.5 to paragraph the wing tip for (h)(1) of cracks, this AD corrosion, minor surface defects, and existing stop-drilled repairs of cracking (initial inspection only), in accordance with paragraph 3.B., Work Instructions, Part 9, of the Accomplishment Instructions of the service bulletin. |
| (6) Group 2 | Before 20 years since the date of issuance of the original Airworthiness Certificate or the date of issuance of the original Export Certificate of Airworthiness | Within 2 years after the effective date of this AD | At intervals not to exceed 2 years | An exterior detailed inspection of the upper and lower chords of the front and rear spars from WBL 70.5 to the wing tip for cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracking (initial inspection only), in accordance with paragraph 3.B., Work Instructions, Part 5, of the Accomplishment Instructions of the service bulletin. |
| (7) Group 2 | Before 20 years since the date of issuance of the original Airworthiness Certificate or the date of issuance of the original Export Certificate of Airworthiness | Within 4 years after the effective date of this AD | At intervals not to exceed 4 years | An HFEC inspection of the upper and lower chords of the front and rear spars from WBL 70.5 to the wing tip for cracks, corrosion, minor surface defects, and existing stop-drilled repairs of cracking (initial inspection only), in accordance with paragraph 3.B., Work Instructions, Part 6, of the Accomplishment Instructions of the service bulletin. |
(i) If any crack, corrosion, or minor surface defect is detected during any inspection required by this AD, before further flight, do the applicable corrective actions in accordance with Part 7 of the Accomplishment Instructions of the service bulletin, except as provided by paragraph (j) of this AD.
(j) If any crack or corrosion is detected during any inspection required by this AD that exceeds the limits specified in the service bulletin, and the bulletin specifies to contact Boeing for appropriate action: Before further flight, repair in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA; or in accordance with data meeting the certification basis of the airplane approved by an Authorized Representative for the Boeing Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make such findings. For a repair method to be approved, the approval must specifically reference this AD.
(k) If any existing stop-drilled repair of previous cracking is detected during any inspection required by this AD, before further flight, permanently repair crack in accordance with paragraph 3.B., Work Instructions, Part 7, paragraph 2., “Crack Repair” of the Accomplishment Instructions of the service bulletin.
(l) Before further flight following any inspection or repair required by this AD, apply a wet layer of BMS 3-23 organic corrosion inhibiting compound or Boeing equivalent, in accordance with the Accomplishment Instructions of the service bulletin.
