Airworthiness Directive · Amendment 39-15454 · Boeing Model 727 Airplanes
Boeing Model 727 Airplanes
This AD applies to all Model 727, 727C, 727-100, 727-100C, 727-200, and 727-200F series airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all Boeing Model 727 airplanes. This AD requires repetitive inspections for cracking or corrosion of the threaded end of the lower segment of the main landing gear (MLG) side strut, and corrective actions if necessary. This AD also requires prior or concurrent inspection for cracking or corrosion of the threads and thread relief area of the lower segment, corrective action if necessary, and re-assembly using corrosion inhibiting compound. This AD results from reports of the threads cracking on the MLG side strut lower segment. We are issuing this AD to prevent a fractured side strut, which could result in collapse of the MLG.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
At the latest applicable time in paragraph (f)(1), (f)(2), or (f)(3) of this AD: Do detailed and magnetic particle inspections for cracking or corrosion of the threaded end of the lower segment of the MLG side strut and do all applicable corrective actions as specified in the Accomplishment Instructions of Boeing Special Attention Service Bulletin 727-32-0338, Revision 4, dated April 7, 2007. Do all applicable corrective actions before further flight. Repeat the inspection thereafter at intervals not to exceed 120 months.
(1) Within 48 months after the last MLG overhaul.
(2) Within 6 months after the effective date of this AD.
(3) Within 120 months after the last MLG overhaul for airplanes on which the actions in Boeing Special Attention Service Bulletin 727-32-0338, Revision 4, dated April 7, 2007, have been accomplished before the effective date of this AD.
Prior to or concurrently with the actions required by paragraph (f) of this AD: Do all applicable actions specified in the service bulletins listed in Table 1 of this AD. Where the lubrication and corrosion protection procedures in any service bulletin listed in Table 1 of this AD differ from those in Boeing Special Attention Service Bulletin 727-32-0338, Revision 4, dated April 7, 2007, use the procedures in Boeing Special Attention Service Bulletin 727-32-0338, Revision 4.
| For— | Service Bulletin— | Describes procedures for these prior or concurrent actions— |
|---|---|---|
| (1) All airplanes | Boeing Special Attention 727-32-0411, Revision 1, dated February 19, 2007 | Inspecting for corrosion or cracking of the threads and thread relief area of the swivel clevis, and improving the corrosion protection of the swivel clevis fitting threads in commonly affected airplanes. |
| (2) Airplanes specified as Options III, IV and V configurations in Boeing Special Attention Service Bulletin 727-32-0338, Revision 4 | Boeing 727 Service Bulletin 32-79, Revision 1, dated February 27, 1967. | Modifying the MLG side strut universal joint. |
| Boeing 727 Service Bulletin 32-157, dated August 30, 1968. | Replacing the MLG side strut swivel bushing, incorporating only parts kit 65-89855-1, and not installing the lube fitting in the lower segment. | |
| (3) Airplanes specified as Option V configuration in Boeing Special Attention Service Bulletin 727-32-0338, Revision 4 | Boeing Service Bulletin 727-32-268, Revision 2, dated February 20, 1981. | Inspecting and modifying the MLG side strut. |
| Boeing Service Bulletin 727-57-163, dated September 17, 1982. | Resolving the interference between the MLG gear beam and the MLG side strut. |
