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Printed page 12. PDF page 18.
the time. of the accident, the N73711 had accumulated 35,496 flight hours and 89,680 flight cycles, (landings), the second highest number of cycles in the worldwide B-737 fleet. Due to the short distance between destinations on some Aloha Airlines routes,Open official document at PDF page 18NTSB AAR-89/03: Aloha Airlines flight 243, N73711
Printed page label not indexed. PDF page 26.
three airplanes which have accumulated 40,400/42,800 flight hours and 44,700/49,900 flight cycles. Cracks were located in the upper skin at stringer four (S-4), left and right, S-10 right and S-14 right, between Body Stations 360 and 907. Therefore, Revision 3Open official document at PDF page 26NTSB AAR-89/03: Aloha Airlines flight 243, N73711
Printed page label not indexed. PDF page 41.
pressure bulkheads. The fuselage, line No. 90, was acquired with just over 59,000 actual flight cycles. Lap joint and tear strap bonds were inspected and found to be in good condition. Boeing then applied over 70,000 additional test cycles. TheOpen official document at PDF page 41NTSB AAR-89/03: Aloha Airlines flight 243, N73711
Printed page label not indexed. PDF page 47.
N73717. Conduct a detailed S-4 lap splice inspection on all airplanes having over 40,000 flight cycles and perform total corrective action on any discrepancies found. Initiate belly skin replacement program. Reinstate existing corrosion control program immediately. InitiateOpen official document at PDF page 47NTSB AAR-89/03: Aloha Airlines flight 243, N73711
Printed page label not indexed. PDF page 48.
scheduled corrosion control and repair. While Aloha aircraft experienced a high number of flight cycles, it. is also true that those same aircraft fly at lower altitudes and pressure differentials than other air carriers. 1.17.8 The National Aviation Safety InspectionOpen official document at PDF page 48NTSB AAR-89/03: Aloha Airlines flight 243, N73711
Printed page 51. PDF page 57.
concern in the Aloha Airlines maintenance program. They were: a high accumulation of flight cycles between structural. inspections, an extended time period between inspections that allowed the related effects of lap joint disbond, corrosion, and fatigue to accumulate, aOpen official document at PDF page 57NTSB AAR-89/03: Aloha Airlines flight 243, N73711