1973 Sunnyvale mid-air collision
Nasa Convair CV-990-30A-5 Coronado and United States Navy Lockheed P-3C Orion · Mid-air collision due to ATC error
Event
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- Event fatalities
- 16 · all aircraft and ground
- Ground fatalities
- Unknown
- Occupants
- 17
- Survivors
- 1
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Military
Aircraft 1 · Convair CV-990-30A-5 Coronado
- Aircraft type
- Convair CV-990
- Category
- Airplane · from aircraft type
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N711NA
- Operator
- Nasa
- Onboard fatalities
- 11
- Occupants
- 11
- Survivors
- 0
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- None · no survivors
- Route
- From Moffet Field, CaliforniaTo Moffet Field, California
Aircraft 2 · Lockheed P-3C Orion
- Aircraft type
- Lockheed P-3
- Category
- Airplane · from aircraft type
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- 157332
- Operator
- United States Navy
- Onboard fatalities
- 5
- Occupants
- 6
- Survivors
- 1
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- Not stated
- Route
- From Moffet Field, CaliforniaTo Moffet Field, California
Cause areas
- Environmental issues › Operating environment
From the investigation findings the Wikipedia article reports, sorted into the NTSB's cause areas with AI assistance.
Approximate · Coordinates from the Wikipedia article; not checked against an investigation report.
From the Wikipedia article
On April 12, 1973, a NASA Convair CV-990 and a US Navy Lockheed P-3 Orion collided on approach to Moffet Field, California. The two aircraft crashed on a golf course, killing all 11 on the CV-990 and 5 of the 6 on board the Orion.
Accident
The Orion departed for a training flight five and a half hours prior to the accident. The plane was flying over the ocean off Big Sur and then returned to Moffet Field to perform touch-and-go landings on runway 32L, which it continued to do for the next hour and a half. The CV-990 was returning from a two-hour flight over Monterey Bay where it was testing a system for surveying sea mammals.
The weather at the airport was good, with great visibility. At 14:46 local time, the CV-990 was cleared for approach to runway 32R. Three minutes later, the CV-990 was cleared to approach runway 32L, the runway the Orion was performing touch-and-go landings on. The pilot of the CV-990 replied "32L, thank you", and the pilot of the P-3 stated "...touch-and-go left side." The CV-990 was descending directly above the P-3, when, according to eyewitnesses, the P-3 initiated a climb. The CV-990 struck the P-3's upper aft fuselage at an altitude of 300 feet and the aircraft crashed entangled on the Sunnyvale Municipal Golf Course a kilometer short of the runway. All 11 on board the CV-990 and 5 of the 6 on board the P-3 died in the crash and ensuing fire.
Investigation and cause
Cause
The collision was a result of mistakes on part of the approach controller. The controller cleared the CV-990 for approach to a runway that the P-3 was already approaching. The crew of the CV-990 did not question this runway change.
Text from the Wikipedia article “1973 Sunnyvale mid-air collision” (revision 1366089433, retrieved 2026-09-18) by its authors, under CC BY-SA 4.0. Extracted as plain text: references, tables, images and some sections are left out. Read the article
Sources
Wikipedia article: 1973 Sunnyvale mid-air collision
- Revision
- 1366089433 · 2026-07-26 · retrieved 2026-09-18
- Wikidata
- Q86728096
- Licence
- Text CC BY-SA 4.0, by the article's authors; Wikidata CC0; town positions GeoNames (CC BY 4.0)
Where each value comes from
- Record
- Wikipedia article "1973 Sunnyvale mid-air collision" (page 82115743, revision 1366089433)
- Date
- Wikipedia infobox: date
- Place and country
- Wikipedia infobox: site
- Map position
- Wikipedia article coordinates
- Aircraft, operator and route
- Wikipedia infobox: aircraft type, registration, operator, origin and destination; route airports from the linked airport articles' Wikidata codes (OurAirports)
- Operation
- operator named as an armed force or military unit in the infobox
- Fatalities
- Wikipedia infobox: total_fatalities
- Ground fatalities
- not stated in the Wikipedia infobox
- Summary
- Wikipedia infobox: summary
Source notes (1)
- Wikipedia · Facts from the Wikipedia article's infobox and coordinates, not checked against an investigation report. Independent review pending.