66-28-04 LOCKHEED: Amdt. 39-310 Part 39 Federal Register November 15, 1966. Applies to Models 188A and 188C Series Airplanes with Steering Housing, P/N 800905-1, with 4,000 or More Landings.
Compliance required as indicated.
(a) For airplanes that have not been inspected in accordance with (d) within the last 200 landings before the effective date of this AD, comply with (d) within the next 300 landings after the last inspection before the effective date of this AD, and thereafter at intervals not to exceed 100 landings from the last inspection.
(b) For airplanes that have been inspected in accordance with (d) within the last 200 landings before the effective date of this AD, comply with (d) within the next 100 landings after the effective date of this AD, and thereafter at intervals not to exceed 100 landings from the last inspection.
(c) Within the next 500 landings after November 18, 1965, unless already accomplished within the last 700 landings before November 19, 1965, comply with (e), and thereafter at intervals not to exceed 1,200 landings from the last inspection.
(d) Visually inspect steering housing, P/N 800905-1, for hydraulic oil leaks. If a leak is indicated, inspect steering housing, P/N 800905-1, before further flight in accordance with (e).
(e) Inspect the 4 1/8-12 UNS-3A screw threaded portion of the bosses on both sides of the steering housing, P/N 800905-1, for cracks using the dye penetrant procedure outlined in Lockheed Alert Service Bulletin 88/SB-576B or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. Gain access to the screw threads by accomplishing the instructions of Sections 2.A through 2.D of Lockheed Alert Service Bulletin 88/SB-576, Revision 1.
(f) Replace any cracked steering housings detected during the inspection specified in (e) before further flight in accordance with the instructions of Sections 2.G through 2.K of Lockheed Alert Service Bulletin 88/SB-576, Revision 1, with a new steering housing, P/N 800905- 1, or with a new improved steering housing, P/N 800905-101.
(g) If a housing, P/N 800905-1, is replaced with a new housing of the same part number or had been replaced prior to the effective date of this AD, inspect in accordance with (d) within 4,100 landings following replacement and thereafter at intervals not to exceed 100 landings from the last inspection, and inspect in accordance with (e) within 4,500 landings following replacement and thereafter at intervals not to exceed 1,200 landings from the last inspection.
(h) For the purpose of compliance with this AD, subject to acceptance by the assigned FAA maintenance inspector, the number of landings may be determined by dividing the airplane's hours' time in service since the installation of the steering housing, by the operator's fleet average time from takeoff to landing for the airplane type.
(i) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Engineering Division, FAA Western Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator.
This supersedes AD 65-26-04.
This directive effective November 25, 1966.