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File: aaany_02.txtIMMEDIATE PAGE: 2 THE AOR. THE FOLLOWING PROVIDES THE CORRECT INFORMATION REGARDING THIS SUBJECT. HEAVY SAND CLOUDS CONFINED TO THE EASTERN PROVINCES OF SAUDI ARABIA, PRIMARILY DHAHRAN, MAY POTENTIALLY CAUSE EARLY UNSCHEDULED ENGINE REMOVALS (UER) ON THE F100-100/-200 ENGINES WITH THE 1800 CYCLE CONFIGURATION CORES (NO PROBLEM WITH THE F100-220 ENGINES OR 4000 CYCLE CONFIGURATION F100-100/-200). SA-ALC PAGE 3 RUVAFLC7793 AIG FOR INFO ONLY ANTICIPATES UER'S APPROXIMATELY 400 CYCLES EARLIER THAN THE NORMAL SCHEDULED DEPOT INTERVAL AND IS TAKING ACTION TO SUPPORT THESE ANTICIPATED EARLIER RETURNS. AS HIGH PRESSURE TURBINE BLADES AND VANES REACH 2000 DEGREES FAHRENHEIT, THE SAND BEGINS TO STICK AND BUILD-UP ON THE AIRFOILS CAUSING EARLY DETERIORATION DUE TO FLAKING OF THE AIRFOIL COATING. TO DATE, 21 ENGINES HAVE BEEN INSPECTED AT HAHN WITH NO SIGNIFICANT SAND-CAUSED DISTRESS OBSERVED ON EITHER THE 1800 CYCLE OR 4000 CYCLE CORE. THE DEPOT MAINTENANCE FACILITY AT SA-ALC IS THOROUGHLY INSPECTING MODULES RETURNING FROM DESERT SHIELD UNITS. BASED ON DATA GATHERED DURING THESE INSPECTIONS, SA-ALC WILL DETERMINE IF ANY FIELD INSPECTION LIMITS NEED TO BE CHANGED. THIS INFORMATION MAY BE A CONSIDERATION REGARDING FUTURE BASING LOCATIONS, TO TAKE INTO ACCOUNT THE SAND PROBLEM IN THE EASTERN PROVINCES THAT IMPACT THE 1800 CYCLE CORE F100-100/-200 ENGINES, BUT NOT THE UPGRADED (4000 CYCLE CORE) F100-100/-200 ENGINES OR THE F100-220. 3. C-130 PROPELLERS. WE ARE CURRENTLY SURGING 180 PROPS AT 6/DAY; EXPECT NO FURTHER PROBLEMS WITH THIS ITEM. B. (U) THE FOLLOWING AIRCRAFT ARE BEING ACCELERATED AT OUR DEPOTS: 1. SM-ALC: TYPE IN-WORK CUM OUTPUT PAGE 4 RUVAFLC7793 AIG FOR INFO ONLY F-111F 6 0 SERIAL NO. ORIG OUTPUT ACCELERATED OUTPUT 70-0713 27 MAR 91 06 JAN 91 70-2381 3 APR 91 14 JAN 91 70-2373 6 MAY 91 20 JAN 91 71-0894 16 MAY 91 06 FEB 91 IMMEDIATE PAGE: 2
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