70-15-10 BRITISH AIRCRAFT CORPORATION: Amdt. 39-1039. Applies to Model BAC 1-11 200 and 400 series airplanes which do not have BAC Modification PM3791 (or Normalair Modification No. 271 TC) incorporated.
To prevent penetration of compressor wheel shroud fragments through the air conditioning system cold air unit compressor scrolls in the event of compressor failure, within the next 1,200 hours' time in service after the effective date of this AD, unless already accomplished, install containment guards on the cold air units P/N 12-525350 (R.H.) and P/N 13-525350 (L.H.) in accordance with Normalair-Garrett, Ltd., Service Bulletin No. 21-314 dated August 18, 1969, or later ARB-approved issue, or an FAA-approved equivalent. (British Aircraft Corporation Model BAC 1-11 Service Bulletin No. 21-PM4350 refers to this subject.)
This amendment becomes effective August 16, 1970.