# NTSB LAX88IA311: Lockheed L-1011-385, N1738D, San Francisco, CA, August 23, 1988

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: August 23, 1988, 00:31 local (07:31 UTC)
- Place: San Francisco, CA
- Coordinates: 37.609848, -122.380744 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.6098&lon=-122.3807&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 39 uninjured
- Status: Completed, report January 25, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 25875
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX88IA311
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/25875/pdf
- Page: https://openairdocs.org/ntsb/LAX88IA311

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Miscellaneous/other, cruise - normal
  - relinquishing of control - intentional, pilot in command
  - physical impairment(other cardiovascular), pilot in command (cause)

## Analysis

DURING CRUISE FLIGHT, APPROXIMATELY ONE HOUR AFTER DEPARTURE, THE CAPTAIN COMPLAINED OF POSSIBLE INDIGESTION. A FEW HOURS LATER, THE CAPTAIN COMPLAINED OF TINGLING IN HIS FINGERS AND NUMBNESS IN HIS SHOULDER. ANOTHER CAPTAIN WAS ON BOARD AND WAS ASKED TO SIT IN THE LEFT SEAT. THE FLIGHT WAS DIVERTED AND WAS LANDED WITHOUT INCIDENT. ONE WEEK AFTER THE INCIDENT, THE CAPTAIN UNDERWENT CORONARY BY-PASS SURGERY.

## Aircraft

- Registration: [N1738D](https://openairdocs.org/deregistered/N1738D-2003-10-27), registration cancelled 2003-10-27, S/N 193C-1234, built 1982 (OpenAirDocs)
- Reported make and model: LOCKHEED L-1011-385
- Registry model: [Lockheed L-1011-385-1-15](https://openairdocs.org/model/lockheed-l-1011-385-1-15) (registry code 5265015) (OpenAirDocs)
- Registry engine: [Rolls-Royce RB-211 series](https://openairdocs.org/engine/rolls-royce-rb-211-series) (registry code 54555, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 193C-1234
- Engines: P&W JT-9D 45000 horsepower turbo fan
- Damage: No damage
- Flight: Part 121
- Registered owner: Delta Airlines
- Airworthiness certificate: Standard, Normal
- Departed: HNL, HONOLULU, HI
- Destination: ATL, ATLANTA, GA
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 56; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left

## Weather

- Conditions: Visual (VMC), Night/dark
- Lowest ceiling: none

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.

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