# NTSB ANC99LA066: de Havilland DHC 2 MK III, N30CC, Anchorage, AK, May 29, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 29, 1999, 15:20 local (23:20 UTC) - Place: Anchorage, AK - Coordinates: 61.160934, -149.989608 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=61.1609&lon=-149.9896&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 4 uninjured - Status: Completed, report June 21, 2000 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 46529 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC99LA066 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46529/pdf - Page: https://openairdocs.org/ntsb/ANC99LA066 ## Probable cause The certificated flight instructor's inadequate supervision of the duel student. Factors associated with the accident were the student's inadvertent stall, and a surging turboshaft engine. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Hard landing, landing - flare/touchdown - stall - inadvertent, dual student (contributing factor) - supervision - inadequate, pilot in command(cfi) (cause) - turboshaft engine - surge (contributing factor) ## Analysis The pilot-in-command, a certificated flight instructor, was providing turbine transition instruction to the second pilot. The accident airplane had been modified by the installation of a Pratt & Whitney PT6 turbine engine. The instructor pilot stated that the propeller governor control was causing 'the engine to surge.' He added that just prior to touchdown on runway 31, while the second pilot was manipulating the controls, the engine again surged, and the airplane landed hard. In the pilot-in-command's written report, and during a later telephone conversation, he reported that during the previous landings, the second pilot failed to 'carry power so as not to land hard again.' The first pilot said that he then instructed the second pilot as to the differences of a turbine engine vs. a piston engine. He wrote: 'I watched very closely until we were over the runway, and once again, quick as a cat, we stalled and hit hard.' The airplane's fuselage sustained substantial damage. ## Factual narrative On May 29, 1999, about 1520 Alaska daylight time, an amphibious float equipped DeHavilland DHC-2 airplane, N30CC, sustained substantial damage while landing at the Lake Hood airstrip, Anchorage, Alaska. The airplane was being operated as a visual flight rules (VFR) instructional flight under Title 14, CFR Part 91, when the accident occurred. The first pilot, seated in the right seat, the second pilot, seated in the left seat, and the two passengers aboard were not injured. Visual meteorological conditions prevailed, and VFR company flight following procedures were in effect. During a telephone conversation with the National Transportation Safety Board investigator-in-charge on May 29, the first pilot, a certificated flight instructor, reported that he was providing turbine transition instruction to the second pilot. The accident airplane has been modified by the installation of a Pratt & Whitney PT6 turbine engine. The first pilot stated that during a previous flight that day the propeller governor control was causing "the engine to surge." The airplane returned to a maintenance facility where repairs were performed, and the airplane was returned to service. He added that about 45 minutes into the second flight, the engine again began to surge, and both pilots elected to once again return to the maintenance facility. The first pilot reported that just prior to touchdown on runway 31, while the second pilot was manipulating the controls, the engine again surged, and the airplane landed hard. In the Pilot/Operator report (NTSB form 6120.1/2) filed by the pilot-in-command, and during a later telephone conversation, he reported that during the previous landings, the second pilot failed to "carry power so as not to land hard again." The first pilot said that he then instructed the second pilot as to the differences of a turbine engine vs. a piston engine. He wrote: "I watched very closely until we were over the runway, and once again, quick as a cat, we stalled and hit hard." The airplane's fuselage sustained substantial damage. Wind conditions at the time of the accident were reported to be 120 degrees at 4 knots. ## Aircraft - Registration: [N30CC](https://openairdocs.org/aircraft/N30CC), registered now, S/N 1566TB4, built 1964 (OpenAirDocs) - Reported make and model: de Havilland DHC 2 MK III (DHC 2 MK I) - Registry model: [Dehavilland DHC 2 MK III](https://openairdocs.org/model/dehavilland-dhc-2-mk-iii) (registry code 2808005) (OpenAirDocs) - Registry engine: [Pratt & Whitney PT6A series](https://openairdocs.org/engine/pratt-whitney-pt6a-series) (registry code 52032, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 1566TB4 - Engines: P&W PT6A-6A 550 horsepower turbo prop - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: William A. Sego - Registered owner: Charles E. Cole - Airworthiness certificate: Standard, Normal - Last inspection: Annual, May 28, 1999, 2 hours before - Departed: Z41 - Airport: Z41, Lake Hood Strip, runway 31, 2,200 × 70 ft, gravel ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 59; flight instructor, airline transport; airplane ratings: multi-engine land, single-engine land, multi-engine sea, single-engine sea; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: right; flight hours: 24,000 total, 1,500 in this make and model, 2,300 as pilot in command, 100 in the last 90 days, 25 in the last 30 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 120° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: 5,500 ft broken - Temperature: 48 °F - Altimeter: 29.00 inHg - Observed at: PAL ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19990529005959A](https://openairdocs.org/incident/19990529005959A), May 29, 1999: Dhav DHC2MK3, Anchorage, AK, Substantial damage. Hard landing. (-23) the aircraft was on short final to runway 31 at lake Hood strip. The engine might have been surging a little bit. The student was a little… ## Other investigations on N30CC (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ANC16FA052](https://openairdocs.org/ntsb/ANC16FA052), Aug 5, 2016: Dehavilland DHC 2 (N30CC), Wasilla, AK, substantial damage. Probable cause: The failure of both pilots to see and avoid each other while landing at a non-tower-controlled airport, which resulted in a midair collision. Contributing to the accident was the absence of radio… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.