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ASN Wikibase Occurrence # 41653
Last updated: 30 September 2020
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Date:23-SEP-1996
Time:17:00
Type:Silhouette image of generic C206 model; specific model in this crash may look slightly different
Cessna U206G Stationair 6
Owner/operator:Stearns Air Alaska
Registration: N7312C
C/n / msn: U206-03872
Fatalities:Fatalities: 3 / Occupants: 5
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Lake Hood Seaplane Base, Anchorage, AK -   United States of America
Phase: Initial climb
Nature:Passenger
Departure airport:Lake Hood Seaplane Base
Destination airport:Lake Hood Seaplane Base
Narrative:
The aircraft (acft) took off from Lake Hood Seaplane Base with 5 occupants aboard. Witnesses said that after lift-off, flaps were retracted & acft pitched to a climb attitude; but stopped climbing & began settling, then struck a utility pole at the airport boundary. It then crashed on a road, & a fire erupted. Calculations showed acft was within allowable weight & balance parameters. Engine exam revealed brass throttle arm (PN 632555-23) was worn & had disconnected from the throttle linkage. It had disconnected where a hard steel bushing (with splines) had been installed (pressed) in a mounting hole in the relatively soft throttle arm. The mounting hole had become 'U' shaped with one side open. The opening was large enough to allow passage of the throttle linkage connecting bolt & bushing. Deposits of material from the throttle arm were found on the bushing splines. The deposits were consistent with rotational motion of the bushing within the mounting hole, as if rotation occurred while tightening the bolt. Teledyne Continental Service Bulletin SB95-2, dated 4/21/95, provided inspection & lubrication procedures for throttle linkages at each 100 hr, progressive, and/or annual inspection. Acft had been flown 80 hrs since its previous (annual) inspection on 8/11/96. CAUSE: improper installation of a connecting bolt in the throttle linkage, which resulted in a worn/disconnected throttle arm, partial loss of engine power, and a forced landing after takeoff.

Sources:

http://www.ntsb.gov/about/employment/_layouts/ntsb.aviation/brief2.aspx?ev_id=20001208X06649&ntsbno=ANC96FA162&akey=1


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
29-Nov-2015 10:28 JINX Updated [Location, Phase, Nature, Departure airport, Destination airport, Source]
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
13-Oct-2017 18:45 TB Updated [Aircraft type, Cn, Location]

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