# NTSB OPS12WA430: Gulfstream Aerospace GV SP (G550), N128GV, Ontario, Canada, March 8, 2012

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Foreign investigation
- Date: March 8, 2012, 18:42 local (18:42 UTC)
- Place: Ontario, Canada
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Defining events: [Enroute-cruise: Air traffic event](https://openairdocs.org/ntsb-events/100); [Enroute-cruise: Air traffic event](https://openairdocs.org/ntsb-events/100)
- Highest injury: No injuries
- Status: Led by another country's authority
- NTSB office: Operational Factors Division
- Lead agency: Other
- NTSB case key (mKey): 83158
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=OPS12WA430
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/83158/pdf
- Page: https://openairdocs.org/ntsb/OPS12WA430

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Communication (personnel): accuracy of communication](https://openairdocs.org/ntsb-findings/02063515): Personnel issues › Task performance · ATC personnel (probable cause), aircraft 1
- [Use of equip/info: use of policy/procedure](https://openairdocs.org/ntsb-findings/02063032): Personnel issues › Task performance · ATC personnel (probable cause), aircraft 1
- [Communication (personnel): accuracy of communication](https://openairdocs.org/ntsb-findings/02063515): Personnel issues › Task performance · ATC personnel (probable cause), aircraft 2
- [Use of equip/info: use of policy/procedure](https://openairdocs.org/ntsb-findings/02063032): Personnel issues › Task performance · ATC personnel (probable cause), aircraft 2

## Factual narrative (aircraft 2)

N217AL, a private Cessna 750, was en route between San Jose, California (KSJC), and Bedford, Massachusetts (KBED) at FL430. N128GV, a private Gulfstream V, was en route between Bradley/Windsor Locks, Connecticut (KBDL), and San Francisco, California (KSFO), at FL430. Twenty nm northwest of YXU VOR on J16 Airway the two aircraft passed, separated by 1 mile laterally and 900 feet vertically, where 5 nm lateral or 2000 foot vertical spacing was required.

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Enroute-cruise: Air traffic event](https://openairdocs.org/ntsb-events/100) (defining event), aircraft 1
- [Enroute-cruise: Air traffic event](https://openairdocs.org/ntsb-events/100) (defining event), aircraft 2

## Aircraft 1

- Registration: N128GV (not matched to a registry record)
- Reported make and model: GULFSTREAM AEROSPACE GV SP (G550) (SP G550)
- Category: Airplane
- Serial number: 5363
- Year built: 2012
- Engines: ROLLS-ROYC BR700-710C411; ROLLS-ROYC BR700-710C411
- Damage: No damage
- Flight: Business, Part 91
- Registered owner: Millrock Aviation Financial LLC
- Departed: BDL, WINDSOR LOCKS, CT
- Destination: SFO, SAN FRANCISCO, CA
- Flight plan: IFR

## Aircraft 2

- Registration: [N717XJ](https://openairdocs.org/aircraft/N717XJ), registered now, S/N 750-0217, built 2003 (OpenAirDocs)
- Reported make and model: CESSNA 750 (NO SERIES)
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (registry code 2076810) (OpenAirDocs)
- Registry engine: [Allison AE3007C series](https://openairdocs.org/engine/allison-ae3007c-series) (registry code 03028, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 750-0217
- Year built: 2003
- Damage: No damage
- Flight: Business, Part 91
- Registered owner: Xojet Inc
- Airworthiness certificate: Unknown
- Departed: SJC, SAN JOSE, CA
- Destination: BED, BEDFORD, MA
- Flight plan: IFR

## Weather



From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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