# NTSB LAX84FA319: Cessna 152, N5157B, Half Moon Bay, CA, May 28, 1984 - Type: NTSB accident investigation - Classification: Accident · Fatal · Field investigation · Final report - Date: May 28, 1984, 15:15 local (22:15 UTC) - Place: Half Moon Bay, CA - Coordinates: 37.439826, -122.410682 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=37.4398&lon=-122.4107&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 2 fatal, 1 serious, 2 minor - Status: Completed - Report: Approved by Office Director - NTSB case key (mKey): 23960 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX84FA319 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23960/pdf - Page: https://openairdocs.org/ntsb/LAX84FA319 ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Midair collision, approach - vfr pattern - final approach - communications - inadequate, pilot in command (contributing factor) - procedures/directives - not followed, pilot of other aircraft (contributing factor) - visual lookout - inadequate, pilot in command (cause) - visual lookout - inadequate, pilot of other aircraft (cause) - In flight collision with terrain/water, descent - uncontrolled - Midair collision, takeoff - initial climb - communications - inadequate, pilot of other aircraft (contributing factor) - procedures/directives - improper, pilot in command (contributing factor) - visual lookout - inadequate, pilot in command (cause) - visual lookout - inadequate, pilot of other aircraft (cause) - In flight collision with terrain/water, descent - uncontrolled ## Analysis (aircraft 2) THE TWO ACFT COLLIDED AFTER N1920Y DECLARED HIS INTENTION TO TAKEOFF AND WAS AIRBORNE APRX HALF WAY DOWN THE RWY. THE OTHER ACFT WAS IN A STEEP DESCENT AT MID-FIELD WHEN HE DOVE INTO N1920Y. BOTH ACFT THEN CRASHED UNCONTROLLED INTO THE GROUND FROM AN ALT OF ARPX 75 FT AGL. ## Analysis (aircraft 1) THE TWO ACFT COLLIDED AFTER N1920Y MADE A RADIO CALL TO ANNOUNCE HIS INTENTIONS OF TAKING OFF. N5157B WAS IN A STEEP DESCENT AT MIDFIELD WHEN HE COLLIDED WITH THE TOP REAR PORTION OF N1920Y. THE COLLISION OCCURRED AT ABOUT 75 FT AGL. THE TWO ACFT CRASHED ON THE ARPT. OTHER ACFT IN THE AREA AT THE TIME OF THE ACCIDENT REPORTED THAT NO RADIO TRANSMISSION WAS HEARD FROM N5157B ANNOUNCING HIS INTENTIONS. ## Aircraft 1 - Registration: [N5157B](https://openairdocs.org/deregistered/N5157B-2014-10-27), registration cancelled 2014-10-27, S/N 15283781, built 1979 (OpenAirDocs) - Reported make and model: CESSNA 152 - Registry model: [Cessna 152](https://openairdocs.org/model/cessna-152) (registry code 2071835) (OpenAirDocs) - Registry engine: [Lycoming 0-235 series](https://openairdocs.org/engine/lycoming-0-235-series) (registry code 41505, 4 cycle) (OpenAirDocs) - Category: Airplane - Serial number: 15283781 - Airframe hours: 2669 - Engines: LYCOMING O-235-L2C 118 horsepower reciprocating - Damage: Destroyed - Flight: Instructional, Part 91 - Operator: Skyway Aviation Inc, doing business as Airline Training Institute - Registered owner: Nichols Esau - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, April 27, 1984, 76 hours before - Departed: SQL, SAN CARLOS, CA - Destination: HAF - Airport: HAF, Half Moon Bay, runway 12, 500 × 150 ft, asphalt ## Aircraft 2 - Registration: N1920Y (not matched to a registry record) - Reported make and model: MOONEY M20D - Category: Airplane - Serial number: 215 - Airframe hours: 3446 - Engines: LYCOMING O-360 180 horsepower reciprocating - Damage: Destroyed - Fire: On-Ground - Flight: Personal, Part 91 - Registered owner: Dean O. Durrant - Airworthiness certificate: Standard, Normal - Last inspection: Annual, August 29, 1983, 69 hours before - Departed: HAF - Destination: APC, NAPA, CA - Airport: HAF, Half Moon Bay, runway 12, 5,000 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot, aircraft N5157B; age 64; commercial, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: right; toxicology performed; flight hours: 11,000 total, 5,000 as pilot in command - Pilot, aircraft N1920Y; age 54; private; airplane ratings: single-engine land; seat: left ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 8 knots - Visibility: 25 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point -0 °F - Observed at: HAF ## FAA reports on this event (2) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19840528018851A](https://openairdocs.org/incident/19840528018851A), May 28, 1984: Cessna 152, Half Moon Bay, CA, Destroyed. Struck a landing Mooney, N7920Y, from above while both on final. Had made a close in steep, nose down approach. - [Accident 19840528018852A](https://openairdocs.org/incident/19840528018852A), May 28, 1984: Mooney M20D, Half Moon Bay, CA, Destroyed. Was struck from above by a 152 N5157B while both were on final for landing. 152 had made a close in steep approach. 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.