Airworthiness Directive · Amendment 39-15139 · Boeing Model 747 Airplanes
Boeing Model 747 Airplanes
Superseded. A later AD replaced this one: AD 2012-02-16. Comply with the one in force.
This AD applies to all Boeing Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all Boeing Model 747 airplanes. This AD requires an inspection of the No. 2 and No. 3 windows on the left and right sides of the airplane to determine their part numbers, and related investigative and corrective actions if necessary. This AD results from loss of a No. 3 window in- flight. We are issuing this AD to detect and correct cracking in the fail-safe interlayer of certain No. 2 and No. 3 glass windows, which could result in loss of the window and consequent rapid loss of cabin pressure. Loss of the window could also result in crew communication difficulties or incapacitation of the crew.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Inspect the No. 2 and No. 3 windows on the left and right sides of the airplane to determine their part numbers, and do all the applicable related investigative and corrective actions, by accomplishing all of the actions specified in the Accomplishment Instructions of Boeing Alert Service Bulletin 747-56A2012, dated August 24, 2006, as applicable. Do all of these actions at the compliance times specified in Tables 1, 2, and 3 of paragraph 1.E. of the service bulletin, as applicable, except as provided by paragraph (g) of this AD. A review of airplane maintenance records is acceptable in lieu of the inspection if the part numbers of the windows can be conclusively determined from that review. Repeat the related investigative and corrective actions thereafter at the interval specified in Table 2 or 3 of the service bulletin, as applicable.
Where Tables 1, 2, and 3 of paragraph 1.E. of Boeing Alert Service Bulletin 747-56A2012, dated August 24, 2006, specify counting the compliance time from “... after the date on this service bulletin,” this AD requires counting the compliance time from the effective date of this AD. After replacing a discrepant window with a new window, do the initial detailed inspection of the new window at the applicable compliance time: (1) within 5,500 flight cycles after installing part number (P/N) 65B27042-() or 65B27043-(), or (2) within 22,000 flight cycles after installing P/N 65B27046-() or 65B27047-().
