# NTSB SEA88IA121: Mcdonnell Douglas DC-8-73F, N791FT, Seattle, WA, June 30, 1988

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: June 30, 1988, 07:02 local (14:02 UTC)
- Place: Seattle, WA
- Coordinates: 47.439418, -122.280838 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.4394&lon=-122.2808&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed, report January 25, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 40744
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA88IA121
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/40744/pdf
- Page: https://openairdocs.org/ntsb/SEA88IA121

## Sequence of events

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

- Miscellaneous/other, landing - roll
  - hydraulic system,line - ruptured (cause)
  - hydraulic system,bypass valve - blocked(partial) (cause)
  - maintenance,adjustment - improper, company maintenance personnel (cause)
  - landing gear,normal brake system - locked
  - landing gear,tire - burst

## Analysis

CREW NOTED INFLIGHT INDICATIONS OF LOSS OF HYDRAULIC FLUID, THEN CARRIED OUT STANDARD PROCEDURES PER CREW MANUAL. EMERG HYD SYS USED TO LOWER FLAPS FOR LNDG. ACFT LANDED WITH FOUR RIGHT BRAKES LOCKED. THE TIRES BLEW AND THE WHEELS WERE GROUND FLAT. INVESTIGATION REVEALED A RUPTURED #3 HYDRAULIC PUMP PRESSURE LINE AND AN IMPROPERLY RIGGED EMERGENCY HYDRAULIC PUMP CONTROL ARM.

## Aircraft

- Registration: [N791FT](https://openairdocs.org/deregistered/N791FT-2006-05-17), registration cancelled 2006-05-17, S/N 46045, built 1969 (OpenAirDocs)
- Reported make and model: MCDONNELL DOUGLAS DC-8-73F
- Registry model: [Douglas DC-8-73F](https://openairdocs.org/model/douglas-dc-8-73f) (registry code 302199F) (OpenAirDocs)
- Registry engine: [CFM International CFM56 series](https://openairdocs.org/engine/cfm-international-cfm56-series) (registry code 13802, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 46845
- Airframe hours: 54083
- Engines: GE CFM-56-2 22000 lbs thrust turbo fan
- Damage: Minor damage
- Fire: On-Ground
- Flight: Part 121
- Operator: Emery Air Freight, doing business as Rosenbalm Aviation
- Registered owner: National Funding Co
- Airworthiness certificate: Standard, Transport
- Departed: HDY, DAYTON, OH
- Flight plan: IFR
- Airport: SEA, Seattle Tacoma, runway 16L, 11,900 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 54; airline transport, flight engineer, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 20,253 total, 6,833 in this make and model, 197 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 7 knots
- Visibility: 15 statute miles
- Lowest ceiling: 8,000 ft broken
- Temperature: 52 °F, dew point 48 °F
- Altimeter: 30.00 inHg
- Observed at: SEA

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19880630042539I](https://openairdocs.org/incident/19880630042539I), Jun 30, 1988: Doug DC873F, Seattle, WA, Minor damage. Right main landing gear brakes locked on landing. Blew all 4 tires and ground down wheel and brake assembly.

## Other investigations on N791FT (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 NYC70IN083](https://openairdocs.org/ntsb/NYC70IN083), Feb 4, 1970: Douglas DC-8 (N791FT), Las Vegas, NV, incident, no damage

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.