Airworthiness Directives; Airbus Airplanes [FR DOC# 2013-15663] SUMMARY: We propose to adopt a new airworthiness directive (AD) for all Airbus Model A318, A319, A320, and A321 series airplanes. This proposed AD was prompted by a determination that
certain special washers used in the retraction jack anchorage fitting bearing
installation in the main landing gear (MLG) were incorrectly manufactured. This
proposed AD would require an inspection of the left-hand (LH) and right-hand (RH) MLG
retraction jack anchorage fitting bearing assemblies to verify that the special
washer is seated correctly, and related investigative and corrective actions if
necessary. We are proposing this AD to detect and correct installation of incorrectly
manufactured special washers, which could lead to a local stress concentration
resulting in possible reduction of the fatigue life of the jack fitting, and
consequent reduction of the structural integrity of the affected MLG.
Airworthiness Directives; The Boeing Company Airplanes [FR DOC# 2013-15660] SUMMARY: We propose to supersede an existing airworthiness directive (AD) that applies to all The Boeing Company Model 737-100, -200, -200C, -300, -400, and -500 series airplanes. The existing AD currently requires repetitive inspections for discrepancies of each carriage spindle of the outboard mid-flaps; repetitive gap checks of the inboard and
outboard carriages of the outboard mid-flaps to detect fractured carriage spindles;
measuring to ensure that any new or serviceable carriage spindle meets minimum
allowable diameter measurements taken at three locations; repetitive inspections,
measurements, and overhaul of the carriage spindles; replacement of any carriage
spindle when it has reached its maximum life limit; and corrective actions if
necessary. Since we issued that AD, we received a report of failure of both flap
carriages. This proposed AD would require reducing the life limit of the carriages,
reducing the repetitive interval for certain inspections and gap checks for certain
carriages. This proposed AD would also add an option, for certain replacements, of
doing an inspection, and related investigative and corrective actions if necessary.
We are proposing this AD to detect and correct cracked, corroded, or fractured
carriage spindles, which could lead to severe flap asymmetry, and could result in
reduced control or loss of controllability of the airplane.