I spent a good 30 years in the airline industry and heard most of the 'dirt' that sometimes never made the news...amazing how quiet things can be when "someone" doesn't want to scare the hell out of the flying public, isn't it?
For example: Eastern airlines AC#817, a B-727 flew a revenue flight with the flap actuator covers on the starboard wing held on with 'speed tape', no one would have ever known about it had one of them not come off when the flaps were lowered for landing in Atlanta. While the actuator cover itself coming off isn't a good thing, keep in mind that the 727 had all three engines back behind the wing...had number 3 sucked that thing in one would have gotten to witness an uncontained engine failure.
example 2: AA 727 flying from DFW to San Diego had the forward lavatory service point leaking 'blue juice' in flight, it was out of sight of the flight crew and passengers as it is just aft of the cockpit and considerably lower. The ice chunk eventually got big enough to break off at 33,000 above the Arizona desert and get carried over the wing by the airflow. Flight engineer noted that the readings for number 3 suddenly all went to zero, assumed it was a sending unit malfunction and never mentioned anything to ATC about an emergency or concern. Upon landing in San Diego the thrust reverser inop warning light illuminated for number 3 when attempting to brake after touchdown and the throttle lever was slack....
Well, that tends to happen when number 3 is no longer attached to the airplane, the shear bolts did their job when that chunk of ice was ingested and rather than tearing the airplane to pieces, they allowed the engine to break away and free fall into the Arizona desert just east of Yuma.
