GILLETTE, WY, USA
N2550T
NAVION H
IMMEDIATELY AFTER TAKEOFF, AT ABOUT 100 FT AGL, THERE WAS AN ABRUPT LOSS OF POWER. THE PILOT LOWERED THE LANDING GEAR & EXECUTED A FORCED LANDING STRAIGHT AHEAD. THE GEAR DID NOT FULLY EXTEND, AND RETRACTED AT TOUCHDOWN. POST CRASH EXAMINATION REVEALED THAT THE INDUCTION AIR 'SCAT' TUBE INNER WALL HAD COLLAPSED AT A 90 DEG BEND, RESTRICTING INTAKE AIR TO THE ENGINE. THE TUBING WAS INSTALLED AS PER A ONE TIME FIELD APPROVED STC. THE ALTERNATE AIR BYPASS WAS DOWNSTREAM OF THE 'SCAT' TUBING. THE TUBING WAS OF A DOUBLE WALL DESIGN WHICH CHARACTERISTICALLY CAN DELAMINATE WHEN EXPOSED TO HIGH HEAT.
AN ENGINE POWER LOSS DUE TO THE COLLAPSE OF THE INDUCTION AIR DUCTING, INADEQUATE MAINTENANCE, AND IMPROPER APPROVAL OF THE MODIFICATION.
Source: NTSB Aviation Accident Database
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