AD 69-25-09 ACTIVE

69-25-09 BRITISH AIRCRAFT CORPORATION: Amdt. 39-890 as amended by Amendment 39-898 is further amended by Amendment 39-966. Applies to BAC 1-11 Model Airplanes.

Compliance is required as indicated, unless already accomplished.

(a) For airplanes with a passenger dropout system control panel not modified in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33- PM4169, Revision 2, dated 1 October 1969 within the next 75 hours' time in service after the effective date of this AD, add the following to the operating limitations section of Airplane Flight Manual:

(1) Under normal operating conditions when oxygen is not required for use by the passengers, the passenger oxygen system shut-off valve located on the right hand console must be maintained in the OFF position.

(2) Operation with passengers above 30,000 feet is prohibited.

(b) For all airplanes within the next 200 hours' time in service after the effective date of this AD, inspect the center roof panel "E" for signs of overheating, damage, and fouls in accordance with British Aircraft Corporation Model BAC 1-11 Alert Service Bulletin No. 33-A-PM 4169, Issue 1, dated 22 May 1969, or later ARB-approved issue or FAA-approved equivalent.

(c) For airplanes with passenger drop-out oxygen system control panel installed which has not been modified in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33- PM 4169, Revision 2, dated 1 October 1969 (or an FAA- approved equivalent), within the next 200 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 200 hours' time in service since the last test, test the passenger drop-out oxygen system control panel for leaks in accordance with British Aircraft Corporation Model BAC 1-11 Alert Service Bulletin No. 33-A-PM 4169, Issue 1, dated 22 May 1969, or later ARB-approved issue or FAA-approved equivalent.

(d) If leaks are found during the test required by paragraph (c), replace the passenger drop-out oxygen system control panel with a serviceable panel of the same part number or with a serviceable panel which has been modified in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33- PM 4169, Revision 2, dated 1 October 1969, or an FAA-approved equivalent. Test the passenger drop-out oxygen system in accordance with the following:

(1) If the passenger drop-out oxygen system control panel is replaced with a serviceable panel of the same part number, continue to test the passenger drop-out oxygen system control panel for leaks in accordance with paragraph (c).

(2) If the passenger drop-out oxygen system control panel is replaced with a serviceable panel which has been modified in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33-PM 4169, Revision 2, dated 1 October 1969 (or an FAA-approved equivalent),within the next 1,000 hours' time in service after the date of installation and thereafter at intervals not to exceed 1,000 hours' time in service since the last test, test the passenger drop-out oxygen system control panel for leaks in accordance with British Aircraft Corporation Model BAC 1-11 Alert Service Bulletin No. 33-A-PM 4169, Issue 1, dated 22 May 1969, or later ARB-approved issue or FAA-approved equivalent.

(e) For airplanes with a passenger drop-out oxygen system control panel installed which has been modified on or before the effective date of this AD in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33-PM 4169, Revision 2, dated 1 October 1969 (or an FAA-approved equivalent), within the next 200 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 1,000 hours' time in service since the last test, test the passenger drop-out oxygen system control panel for leaks in accordancewith British Aircraft Corporation Model BAC 1-11 Alert Service Bulletin No. 33- A-PM 4169, Issue 1, dated 22 May 1969, or later ARB-approved issue or FAA-approved equivalent.

(f) If leaks are found during the test required by paragraph (e), replace the passenger drop-out oxygen system control panel with a serviceable panel which has been modified in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33-PM 4169, Revision 2, dated 1 October 1969, or an FAA-approved equivalent and continue to inspect in accordance with Paragraph (e).

(g) Upon request of the operator an FAA maintenance inspector (subject to prior approval of the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region) may adjust the repetitive inspection intervals specified in paragraph (e) of this AD to permit compliance at an established inspection of the operator, if the request contains substantiating data to justify the increase for the operator.

(h) For all airplanes on or before 1 July 1970, modify the flight deck roof lighting control panel "E" and panel installation in accordance with Parts (a1), (d1), (d2), (f), (g), and (h) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33-PM 4169, Revision 2, dated 1 October 1969, or an FAA-approved equivalent.

(i) For all airplanes on or before 1 July 1970, replace the existing passenger drop- out oxygen system control panel with a serviceable panel which has been modified to incorporate rigid oxygen pipes in lieu of flexible hoses in accordance with Part (C) of British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 33-PM 4169, Revision 2, dated 1 October 1969, or an FAA-approved equivalent.

(j) When paragraph (i) has been accomplished, the operating limitations required by paragraph (a) may be removed from the Airplane Flight Manual.

Amendment 39-890 effective December 15, 1969.

Amendment 39-898 effective December 19, 1969.

Thisamendment (39-966) becomes effective March 31, 1970.