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59-09-04: 59-09-04 VERTOL: Applies to all Models 44A, B, and C Helicopters.
Compliance required as indicated, but no later than May 15, 1959.
(1) A failure of the low velocity fan disc assembly, P/N 42P6422, has recently been experienced in a Vertol 44 helicopter. The failure originated as a crack at the blade retaining bolt hole in the disc flange forward face, progressing radially into the flange and disc radius and continuing circumferentially in the radius area for 14 to 16 inches. This portion of the fan disc, containing six fan blades, then separated from the fan and was thrown through the left-hand side of the fuselage.
(2) To preclude recurrence of said failures, fan disc assemblies, P/N 42P6422, must be retired at 400 hours' time.
(3) It is permissible to operate the fan to 500 hours, providing the following requirements are complied with at, or before, 400 hours' time:
a. Remove spinner, P/N 42P6420.
b. Visually inspect the disc flange in the blade retaining bolt hole area for evidence of cracks.
c. Reassemble, adding AN 960-416 washers under the 32 nuts in place of removed spinner. (The spinner must not be reinstalled, to facilitate future inspections.)
d. Inspect the above-mentioned areas for evidence of cracks every four (4) flight-hours.
e. Any evidence of cracks will be cause for immediate retirement of the fan disc assembly. Fans removed from service because of cracks will be destroyed or mutilated so as to preclude the possibility of their being returned to service.
(Vertol Service Department Technical Memorandum No. 1901 covers this same subject.)
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96-07-07: This amendment adopts a new airworthiness directive (AD), applicable to certain Jetstream Model 4101 airplanes, that requires an inspection to verify the proper position of "door open" placards on the inside of the main entrance door, and replacement with new placards appropriately positioned, if necessary. This amendment is prompted by a report that the "door open" placards on the inside of the main entrance door, as currently installed, may not be visible to passengers or flightcrew when the door handle is in the open position. The actions specified by this AD are intended to ensure that certain placards on the inside of the main entrance door are clearly visible and perform their intended function in the event of an emergency evacuation.
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2017-08-06: We are adopting a new airworthiness directive (AD) for certain General Electric Company (GE) GE90 turbofan engines. This AD was prompted by a report of an engine and airplane fire. This AD requires replacing affected fuel/oil lube/servo coolers (``main fuel oil heat exchangers'') with a part eligible for installation. We are issuing this AD to correct the unsafe condition on these products.
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2005-20-04: The FAA is adopting a new airworthiness directive (AD) for Teledyne Continental Motors (TCM) GTSIO-520 series reciprocating engines. This AD requires initial and repetitive visual inspections of the starter adapter assembly and crankshaft gear. This AD also requires unscheduled visual inspections of the starter adapter assembly and crankshaft gear due to a rough-running engine. This AD also requires replacement of the starter adapter shaft gear needle bearing with a certain bushing. Also, this AD requires installation of a certain TCM service kit at the next engine overhaul, or at the next starter adapter replacement, whichever occurs first. This AD results from six service difficulty reports and one fatal accident report received related to failed starter adapter assemblies. We are issuing this AD to prevent failure of the starter adapter assembly and or crankshaft gear, resulting in failure of the engine and possible forced landing.
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98-06-18: This amendment adopts a new airworthiness directive (AD), applicable to certain Fokker Model F28 Mark 0070 and Mark 0100 series airplanes, that requires replacement of the operating handles of the overwing emergency exits with improved handles that have self- illumination. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to ensure that the operating handles of the overwing emergency exits are clearly visible during an emergency evacuation.
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96-23-11: This amendment adopts a new airworthiness directive (AD) that is applicable to certain Jetstream Model 4101 airplanes. This action requires a one-time test to verify if the disconnect lock of the aileron disconnect control system functions properly, and follow-on actions, if necessary. This amendment is prompted by a report that a disconnect unit of the aileron control system was found to be jammed and unserviceable. The actions specified in this AD are intended to detect and correct such jamming, which could result in reduced controllability of the airplane.
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96-04-06: This amendment adopts a new airworthiness directive (AD), applicable to certain Airbus Model A320 series airplanes, that requires replacement of the relays in the forward electronics rack of the braking system of the landing gear with new relays. This amendment is prompted by reports of loss of the systems of the braking/steering control unit (BSCU) on these airplanes due to electrical overvoltage of the relays. The actions specified by this AD are intended to prevent such electrical overvoltage of the relays, which could result in the loss of the BSCU systems, and subsequent loss of the antiskid functions and nose wheel steering of the airplane.
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51-09-03: 51-09-03 TAYLORCRAFT: Applies to All Series Aircraft Below Serial Number 13001 Incorporating a Pushpull Type Fuel Shutoff Control.
Compliance required not later than June 1, 1951.
To prevent accidental operation of the fuel shutoff valve during flight, a safety device must be installed on this control. The device is to prevent inadvertent operation of the fuel shutoff valve by requiring a definite and positive movement by the pilot before the control can be operated. Taylorcraft P/N B12-947-3 or equivalent is considered satisfactory. P/N B12-947 which was previously installed in some Taylorcraft airplanes must be replaced by this improved part.
(Taylorcraft Service Bulletin No. 66 dated December 6, 1950, covers this same subject.)
This supersedes AD 47-13-01.
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2005-19-27: The FAA is adopting a new airworthiness directive (AD) for certain Airbus Model A330-200 series airplanes. This AD requires inspecting to determine the serial numbers and flight cycles of the fuel jettison valves and removing certain valves as applicable. This AD also requires doing a one-time inspection for cracks of the remaining jettison valves and removing any cracked valves. This AD also requires modifying the diameters of the six attachment holes in the wing bottom skin panel before installing a new or serviceable jettison valve. This AD results from reports of fuel leaks in the fuel jettison system located on the wings. We are issuing this AD to prevent fuel leaks from the fuel jettison outlets, which could result in fuel vapors coming into contact with ignition sources, and consequent fire or explosion.
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98-06-12: This amendment adopts a new airworthiness directive (AD) that is applicable to Eurocopter France Model AS-350B, BA, B1, B2, and D helicopters, and Model AS 355E, F, F1, F2, and N helicopters. This action requires replacing certain tailboom attachment bolts located above the cargo compartment floor. This amendment is prompted by two reports of attachment bolts strength properties not meeting design specifications during manufacture. The actions specified in this AD are intended to identify and remove the weaker bolts and to prevent the separation of the tailboom from the helicopter, and subsequent loss of control of the helicopter.
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