67-25-07 VICKERS: Amdt. No. 39-473, Part 39, Federal Register September 7, 1967. Applies to Viscount Models 744, 745D and 810 Series Airplanes.
Within the next 1,000 hours' time in service after the effective date of this AD, unless already accomplished:
Replace Graviner D.1870 or D.1870N/1 loop type overheat detectors with Graviner D.5352N/1 coil overheat detectors. Replace Graviner point type detectors as shown in the following table:
Existing P/N
Replacement P/N
Graviner 4D/3
Graviner 134D/3
Graviner 13D/3
Graviner 135D/3
Graviner 68D/3
Graviner 136D/3
Graviner 150D/07/180
Graviner 150D/07/210
Detectors which are equivalent to the specified Graviner detectors may be used as replacements, subject to the approval of the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region.
Replace the detectors in accordance with British Aircraft Corporation Limited (BAC) Modification Bulletin No. D.3187, Issue 2, (700 Series), and Modification Bulletin No. FG.2055, Issue 2, (810 Series), or an equivalent approved by the Chief, Aircraft Certification Staff, FAA, Europe, Africa, and Middle East Region.
This amendment effective September 7, 1967.