FEDERAL AVIATION AGENCY WASHINGTON, D. C. 20553
C)
P In Reply Y Refer to: FEB—321
March 13, 1964
Mr. Leon H. Tanguay Director, Bureau of Safety Clv11 Aeronautics Board. Washington; D. C. 20h28
Dear Mr. Tanguay:
This is in reply to your letter of December 2?, 1963, reference B-80-96, concerning AXXICO Airlines.
The Agency has roves Uigated the maintenance practices of AMIGO Airlines directing partwalar attention to C-hé aircraft N679hl and N67935.
The Significant actions taken by the Agency and AAXICO are as follows:
1. Violation actlon is being taken against the carrier in connection with replacement of engine conponents by non-certificated military personnel.
2. The carrier has issued instructions to AAXICO flight crews prohibiting the use of non-certificated, unqualified mechanics for maintenance.
3. The carrier elected to replace the maintenance supervisor at Hill Air Force Base.
’4. A fleet campalgn directed toward erratic oil pressure problems was conducted of all AMIGO (3—116 aircraft. the campaign included removal of oil coolers and temperature regulators, and adjustment of oil regulators to manufacturers' specifications. Further, engines with low oil pressure tendencies, having low-capacity oil pumps, were converted to high—capacity pumping by changing the drive/driven gear ratio.
5. In addition to the above, we determined that the following related actions were also implemented. These actions included reduction of cmse horsepower; reused operational procedures to avaid operation under unloaded cylinder pressures; av01dance of rapid changes in cylmder temperatures; reused inspection procedures requiring horoscope inepectmn
