Some of the most common causes of aviation accidents include:
Propeller Blade
January 12, 2002, a Hamilton Sundstrand 568E propeller blade separated adjacent to the propeller hub on the right engine of an Anions de Transport Regional airplane. Shortly after takeoff the pilots felt high vibrations in the airplane as the right engine’s low oil pressure warning light illuminated. The fuel lever jammed when the pilots tried to show down the engine and they had to emergency land, leaving minor damage to the airplane.
Require Hamilton Sundstrand to perform additional analytical examinations and testing, including removal of the compression wrap so that the tulip can be fully examined, of a sample of high service-time 568F propeller blades with serial numbers 1,699 or greater to determine if rust and corrosion pitting are occurring in the fillet radius, and, on the basis of the results of those examinations, require additional inspections, modifications, or repairs as appropriate.
For all Hamilton Sundstrand 568F propeller blades with serial numbers 1 through 1,698:
(1) Require the immediate inspection and repair (including removal of the compression wrap and any existing corrosion, a nondestructive inspection for cracks, shot peening of the radius, and installation of an appropriate corrosion protection system) of all blades that have been in service more than 6 years or 11,700 hours; (2) Immediately determine a conservative threshold for the inspection and repair of the remaining blades that is
appropriately less than 6 years or 11,700 hours in service, taking into account the uncertainties in the failure mechanism (including the initiation and growth rate for the pitting and fatigue cracking); (3) Require the immediate inspection and repair of those
propeller blades that have already reached or exceeded the threshold determined as a result of (2), above; and (4) For those propeller blades that are not immediately inspected and repaired in accordance with (1) and (3), above, require that they be inspected and repaired as soon as possible, but no later than the threshold determined as a result of (2), above. (Urgent)
In-Flight Fires
Due to investigations on in-flight fires there were various aviation safety recommendations made.
November 29, 2000, an American Airlines operated DC-9-82 was struck by lightning and had an in-flight fire that forced an emergency landing and evacuation, leaving minor damages. August 8, 2000, an Air Tran Airways operated DC-9-32 had to emergency land after an in-flight fire started, resulting in minor injuries and smoke inhalation. September 17, 1999, a Delta Air Lines operated McDonnell Douglas MD-88 made an emergency landing and evacuation after an in-flight fire started, leading to minor damage. June 2, 1983, an Air Canada operated DC-9 made an emergency landing and evacuation due to an in-flight fire, detected by a passenger. The fire caused 23 passengers to become trapped in the aircraft to their deaths, and the airplane was completely destroyed.
Omission in Pilot Training
There are a couple recommendations made in response to industry-wide safety issues that involved the omission in pilot training on transport-category airplanes. The NTSB has found that many pilot training programs do not include information about structural certification requirements for the rudder and vertical stabilizer on transport-category airplanes. Even at speed below the design maneuvering speed, the NTSB found that sequential full opposite rudder inputs may result in structural loads exceeding what is addressed in the requirements. Some airplane pilots may think that the rudder limiter systems installed on most transport-category airplanes that limit rudder input from overloading the structure prevent sequential full opposite rudder deflections from damaging the structure. Structural certification requirements for transport-category airplanes do not take maneuvers into account and the sequential opposite rudder inputs can produce loads higher than required for certification and exceed structural capabilities of the airplane.
November 12, 2001, an American Airlines flight was destroyed after crashing into a residential area following takeoff. Prior to the impact, the vertical stabilizer and rudder separated from the fuselage, leaving the 2 pilots, 7 flight attendants, 251 passengers, and 5 people on the ground dead.
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