N57MH

ATA 2150

DURING CLIMB THROUGH 4000 FEET SHORTLY AFTER TAKEOFF, UPON BLEED AIR TRANSITION FROM APU TO ENGINES, CREW NOTICED SMOKE (NON-ELECTRICAL) IN COCKPIT COMING FROM LEFT SIDE A/C VENTS. CLIMB DISCONTINUED AND UPON SWITCHING FROM ENGINE BLEEDS BACK TO APU BLEED, SMOKE BEGAN TO DISSIPATE. CHECKLIST FOLLOWED, UNSCHEDULED LANDING PERFORMED AND LANDED WITHOUT INCIDENT. MAINTENANCE EVALUATION DIDN’T FIND ANY EVIDENCE OF OIL OR OTHER BLEED CONTAMINATION, HOWEVER SUSPECTED RESIDUAL CLEANING SOLUTION FROM ENGINE COMPRESSOR WASHES WENT THROUGH ACM SYSTEM AND QUICKLY VAPORIZED CAUSING THE SMOKE FROM GASPERS. MAINTENANCE CLEANED COALESCER SOCKS AND PERFORMED ENGINE RUNS CYCLING THROUGH ALL BLEEDS WITHOUT ANY ISSUES. PROBABLE CAUSE ATTRIBUTED TO RESIDUAL CLEANING SOLUTION AND MOISTURE IN ENGINE BLEEDS FROM COMPRESSOR WASHES DURING MX VISIT, WHICH MOVED THROUGH ACM SYSTEM UPON APU TO ENGINE BLEED TRANSITION. SUBSEQUENT ENGINE RUNS AND CHECK FLIGHT PERFORMED WITHOUT ANY ISSUES.

ATA 5210

CABIN DOOR WAS REMOVED AND SENT TO REPAIR FACILITY FOR COMPLIANCE OF BOMBARDIER SERVICE BULLETIN 601-0613 R1. THE FOLLOWING ITEMS WERE FOUND WITH CORROSION DURING SERVICE BULLETIN COMPLIANCE: AFT SUPPORT ANGLE P/N 600-31902-65 LOWER END, ATTACH CLIP P/N 600-31902-54 AT STA 329.06, ATTACH CLIPS P/N 600-31902-53 AND 600-31902-54 AT STA 320.10, AND ATTACH CLIP P/N 600-31902-54 AT STA 338.

ATA 3230

AS PART OF A SCHEDULED INSPECTION BEING PERFORMED, AN EMERGENCY EXTENSION CHECK OF THE LANDING GEAR WAS PERFORMED. NITROGEN WAS HEARD LEAKING FROM THE LEFT SIDE NOSE WHEEL WELL AREA. FURTHER TROUBLESHOOTING REVEALED THE NOSE LANDING GEAR UPLOCK ACTUATOR (PNEUMATIC) TO BE LEAKING BY THE PISTON SHAFT AREA. CONSIDERABLE CORROSION WAS FOUND INTERNALLY (PISTON SPRING & CYLINDER SHAFT AREA).