ANC99LA125

NTSB accident investigation · Learjet 35 · Glennallen, AK · August 27, 1999

Accident · No injuriesLimited investigationFinal report
Date
August 27, 1999, 10:04 local (18:04 UTC)
Place
Glennallen, AK
Injuries
4 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N90WRLearjet 35
Weather
Visual (VMC) · Day
Status
Completed · report November 30, 2000
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19990827024789A
Case key
47323

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot-in-command's delay in applying remedial action. A factor associated with the accident was the second-in-command's failure to maintain proper airspeed during final approach.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Hard landingLanding - flare/touchdown
Airspeed(vref) - not maintainedCopilot/second pilotFactor
Remedial action - delayedPilot in commandCause
Wing,wingtip - buckled

Analysis

The first officer was flying the airplane. During final approach, in an attempt to lose altitude and align the airplane with the centerline, the first officer turned the airplane to the right, retarded the throttles, and applied nose down elevator. As the airplane passed over the runway threshold, the airspeed decreased rapidly, and an excessive descent rate was noted. The captain then took control of the airplane, and applied full engine power in order to cushion the touchdown. The captain characterized the touchdown as 'firm', but within acceptable limits. He added that the initial touchdown was made on the left main landing gear, and with the left wing low. Both pilots stated that a postlanding inspection was not accomplished. About 45 minutes later, both pilots, the two flight nurses, and one patient, boarded the airplane for the return trip to Anchorage. The first officer said that just prior to departure, she made a quick walk around inspection of the airplane, and saw no airframe anomalies. After arrival in Anchorage, an inspection by ground personnel discovered a 3 feet by 4 inch scrape located on the lower portion of the left wing-tip fuel tank, and wrinkling of the upper left wing panel, adjacent to the left wing-tip fuel tank attach point.

Factual narrative

On August 27, 1999, about 1004 Alaska daylight time, a Gates Lear Jet, model 35 airplane, N90WR, operated by F.S. Air Service, Inc., of Anchorage, Alaska, sustained substantial damage during a hard landing at Gulkana Airport, Gulkana, Alaska. Gulkana is located about 8 miles northeast of Glennallen, Alaska, at 62.09.29 north latitude, 145.27.40 west longitude. The airplane was being operated as an instrument flight rules (IFR) medical transport flight under Title 14, CFR Part 91, when the accident occurred. The two certificated airline transport pilots, and the two flight nurses aboard, were not injured. Visual meteorological conditions prevailed at Gulkana, and an IFR flight plan was filed. The flight originated at the Anchorage International Airport, Anchorage, about 0935.

During an interview with the National Transportation Safety Board investigator-in-charge on August 30, the captain of the accident airplane reported that the airplane was being positioned in order to transport a patient to Anchorage. He stated that it had been previously agreed upon that the outbound trip to Gulkana was to be flown by the first officer. The captain said that the first officer made a VOR instrument approach to runway 14. He said that as the flight descended below the cloud cover and the airport environment came into view, it was determined that the airplane was too high, and left of the runway centerline. He said that in an attempt to lose altitude and align the airplane with the centerline, the first officer turned the airplane to the right, retarded the throttles, and applied nose down elevator. The captain said that as the airplane passed over the runway threshold, the airspeed decreased rapidly, and an excessive descent rate was noted. He said that he then took control of the airplane, and applied full engine power in order to cushion the touchdown. The captain characterized the touchdown as "firm", but within acceptable limits. He added that the initial touchdown was made on the left main landing gear, and with the left wing low.

After landing, the airplane was taxied to the parking area, and the medical crew and flight crew disembarked uneventfully. The captain and first officer accompanied the medical crew to the hospital.

Both crew members stated that a postlanding inspection was not accomplished.

Both pilots, the two flight nurses, and one patient, returned to the airport about 45 minutes later, and prepared for the return trip to Anchorage. The first officer said that just prior to departure, she made a quick walk around inspection of the airplane. She stated that she saw no airframe anomalies during her inspection. The flight departed for the return trip to Anchorage about 1125.

After arrival in Anchorage, ground personnel discovered a 3 feet by 4 inch scrape located on the lower portion of the left wing-tip fuel tank, and wrinkling of the upper left wing panel, adjacent to the left wing-tip fuel tank attach point.

The closest weather observation station is located at the Gulkana Airport. On August 27, at 0950, a contract weather observer was reporting in part: Sky conditions and ceiling, 400 feet scattered, 2,400 feet broken, 5,000 feet overcast; visibility, 20 statute miles; wind, 20 degrees at 5 knots.

Both flight crew members noted that there were no preaccident mechanical anomalies with the airplane.

Aircraft

Registration
N90WR
Reported as
Learjet 35
Category
Airplane
Serial number
35-022
Airframe hours
13,361
Engine
Garrett TFE 731, 3,500 lbs thrust, turbo fan
Damage
Substantial damage
Flight
Positioning · Part 91
Registered owner
F.S. Air Service, Inc.
Airworthiness certificate
Standard, Normal
Last inspection
Continuous airworthiness · August 25, 1999 · 23 hours before
Departed
ANC · Anchorage, AK
Destination
GKN
Flight plan
IFR
Airport
GKN · Gulkana, runway 14, 5,000 × 100 ft, asphalt

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
40
Certificate
Airline transport
Airplane ratings
Single-engine land, Single-engine sea, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
5,022 total · 860 in this make and model · 4,600 as pilot in command · 160 in the last 90 days · 80 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
20° at 5 knots
Visibility
20 statute miles
Lowest ceiling
2,400 ft broken
Temperature
46 °F, dew point 45 °F
Altimeter
29.00 inHg
Observed at
GKN

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.