NTSB CAROL · Event
Event CHI91IA062
Registry · N396UA
FAA Aircraft Registry record.
Make / Model
ZIPLINE INTERNATIONAL INC P2 ZIP
ADS-B equipped
Yes — Mode-S A49AD6
Registrant of record
ZIPLINE INTERNATIONAL INC
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
IMPROPER USE OF THE THROTTLES, AND FAILURE TO MAINTAIN DIRECTIONAL CONTROL BY THE FIRST OFFICER. FACTORS RELATED TO THE INCIDENT ARE: ICE ON THE RUNWAY, LACK OF TOTAL EXPERIENCE IN THE TYPE AIRCRAFT AND OPERATION BY THE FIRST OFFICER, AND INADEQUATE SUPERVISION BY THE CAPTAIN.
Factual narrative
THE FIRST OFFICER HAD CONTROL OF THE AIRCRAFT FOR TAKEOFF ON ICE COVERED RUNWAY. AFTER THE THROTTLES WERE ADVANCED FOR TAKEOFF, THE AIRCRAFT ROLLED STRAIGHT AHEAD FOR APPROXIMATELY 2 SECONDS, THEN BEGAN TO SLIDE TO THE LEFT. THE CAPTAIN TOOK CONTROL OF THE AIRCRAFT BUT COULD NOT MAINTAIN DIRECTIONAL CONTROL, OR STOP THE AIRCRAFT. THE AIRCRAFT DEPARTED THE LEFT SIDE OF THE RUNWAY AND CAME TO A STOP IN THE MUD AND SNOW. AN EMERGENCY EVACUATION WAS CONDUCTED. INVESTIGATION REVEALED THAT ON APPLICATION OF POWER FOR TAKEOFF, THE RIGHT ENGINE HAD A 10% GREATER N1 THAN THE LEFT ENGINE. THE FIRST OFFICER WAS ON HIS INITIAL OPERATING EXPERIENCE IN THE AIRCRAFT. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1991_CHI91IA062.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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