[ Pobierz całość w formacie PDF ]
.The aircraft’s cost to Trans America Airlines was six and a half million dollars.The day before yesterday N-731-TA had flown from Düsseldorf, Germany, and, two hours out from Lincoln International, an engine overheated.As a precaution, the captain ordered it shut down.None of the aircraft’s passengers were aware that they were operating with three engines instead of four; if necessary, the aircraft could have flown on one.Nor was the flight even late arriving.Trans America Maintenance, however, was advised by company radio.As a result, a crew of mechanics was waiting, and whisked the airplane to a hangar as soon as passengers and freight were disembarked.Even while taxiing to the hangar, diagnostic specialists were at work, seeking out the airplane’s trouble, which they located quickly.A pneumatic duct—a stainless steel pipe around the affected engine—had cracked and broken in flight.The immediate procedure was for the engine to be removed and a replacement installed.That was relatively simple.More complicated was the fact that for several minutes before the overheating engine was shut down, extremely hot air must have escaped into the engine nacelle.This heat could conceivably have damaged one hundred and eight pairs of wires from the aircraft’s electrical system.Close examination of the wires showed that while some had been heated, none apparently had suffered damage.If a similar condition had occurred within an automobile, bus, or truck, the vehicle would have been put back into service without question.But airlines took no such chances.It was decided that all one hundred and eight pairs of wires must be replaced.The work of replacement was highly skilled, but exacting and tedious because only two men at a time could operate in the confined space of the engine nacelle.Moreover, each pair of wires must be identified, then connected painstakingly to cannon plugs.A nonstop, day-and-night effort was planned, with teams of electrical mechanics relieving each other.The entire job would cost Trans America Airlines thousands of dollars in skilled man-hours and lost revenue while the big aircraft was unproductive on the ground.But the loss was accepted without question, as all airlines accepted such losses in pursuit of high safety standards.The Boeing 707—N-731-TA—which was to have flown to the West Coast and back before its flight to Rome, was taken out of service.Operations was advised, and hastily shuffled schedules to help bridge the gap.A connecting flight was canceled and several dozen passengers transferred to competitive airlines.There was no substitute aircraft.When it came to multimillion-dollar jets, airlines did not carry spares.Operations, however, urged Maintenance to have the 707 ready for Flight Two to Rome, which was then thirty-six hours away from scheduled departure.An operations vice-president in New York personally called the Trans America base maintenance chief, and was told: “If we can get it ready for you, we will.” A top-notch foreman and a crack crew of mechanics, and electricians were already on the job, all of them aware of the importance of finishing quickly.A second crew, to relieve the others through the night, was being rounded up.Both crews would work extra hours until the job was done.Contrary to general belief, aircraft mechanics took a close interest in the operational flights of airplanes they serviced.After a complex job, or a rush one such as this, they would follow the progress of a particular airplane to learn how their work had stood up.It was a source of satisfaction to them when, as usually happened, the airplane functioned well.Months later they might say to each other, observing an airplane taxiing in, “There’s old 842.Remember that time … and the trouble we had with her.I guess we cured it.”Through the critical day and a half following discovery of the trouble with N-731-TA, work on the airplane, though slow by its nature, continued as speedily as possible.At length, three hours from Flight Two’s departure time, the last of the hundred-odd pairs of wires was reconnected.It took another hour to replace the engine cowlings and for an engine run-up on the ground.Then, before the airplane could be accepted for service, an air test was required.By this time, urgent calls from Operations demanded: Would N-731-TA be ready for Flight Two or not? If not, would Maintenance for Chrissake say so, so Sales could be informed of a possible long delay, and passengers notified before they left their homes.His fingers crossed, and touching wood, the maintenance chief replied that, barring complications on the air test, the aircraft would be available on time.It was—but only just.The chief Trans America pilot at the base, who had been standing by for just that purpose, test flew the airplane, barreling up through the storm to clearer altitudes above.He reported on return: “You guys down here’d never know it, but the moon’s still there,” then certified N-731-TA as completely airworthy.Executive pilots liked that kind of assignment; it helped build up their needed flying hours without going far from their desks [ Pobierz całość w formacie PDF ]