# NTSB FTW85IA028: Swearingen SA226TC, N511SS, Tulsa, OK, October 26, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: October 26, 1984, 08:24 local (13:24 UTC)
- Place: Tulsa, OK
- Coordinates: 36.19075, -95.909545 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.1908&lon=-95.9095&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 9 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21588
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85IA028
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21588/pdf
- Page: https://openairdocs.org/ntsb/FTW85IA028

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise - normal
  - hydraulic system,line - fatigue (cause)
  - hydraulic system,line - burst (cause)
  - maintenance,service bulletin/letter - not followed (contributing factor)

## Analysis

DURING CRUISE, THE CREW EXPERIENCED A LOSS OF HYDRAULIC PRESSURE & SMOKE IN THE COCKPIT, THEN DONNED THEIR OXYGEN MASKS.THEY USED THE EMERG GEAR EXTENSION SYSTEM & MADE A SAFE EMERG LANDING. AN EXAM REVEALED A CRACKED 2000 PSI ALUMINUM HYDRAULIC LINE HAD SPRAYED FLUID IN THE COCKPIT. A RECENTLY ISSUED SERVICE BULLETIN RECOMMENDED REPLACEMENT OF THAT LINE, BUT PARTS WERE REPORTEDLY NOT AVAILABLE. LONGITUDINAL SCRATCHES WERE FOUND ALONG THE LENGTH OF THE LINE. FAILURE HAD OCCURRED AT A LONGITUDINAL SCRATCH AT A BEND IN THE LINE.

## Aircraft

- Registration: [N511SS](https://openairdocs.org/deregistered/N511SS-2013-03-25), registration cancelled 2013-03-25, S/N TC205, built 1973 (OpenAirDocs)
- Reported make and model: SWEARINGEN SA226TC
- Registry model: [Swearingen SA226TC](https://openairdocs.org/model/swearingen-sa226tc) (registry code 8780404) (OpenAirDocs)
- Registry engine: [AiResearch 331 SER 605HP](https://openairdocs.org/engine/airesearch-331-ser-605hp) (registry code 01502, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: TC205
- Airframe hours: 22656
- Engines: AIRESEARCH TPE 331 940 horsepower turbo prop
- Damage: Minor damage
- Flight: Part 135
- Operator: Scheduled Skyways
- Registered owner: Swj Leasing Co.
- Airworthiness certificate: Standard, Transport; Standard, Normal
- Departed: TUL, TULSA, OK
- Destination: FYV, FAYETTEVILLE, AR
- Flight plan: IFR
- Airport: TUL, Tulsa Intl', runway 26, 7,700 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 27; flight instructor, airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 6,495 total, 2,866 in this make and model, 5,119 as pilot in command, 263 in the last 90 days, 5 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: calm
- Visibility: 2 statute miles
- Lowest ceiling: 1,300 ft overcast
- Temperature: 57 °F, dew point 57 °F
- Altimeter: 30.00 inHg
- Observed at: TUL

## FAA reports on this event (1)

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

- [Accident 19841026075479A](https://openairdocs.org/incident/19841026075479A), Oct 26, 1984: Swrngn SA226TC, Tulsa, OK. After diverting due to weather, lost hydraulic pressure, smoke in cabin. Found ruptured hydraulic line.

## Other investigations on N511SS (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 MKC85FA032](https://openairdocs.org/ntsb/MKC85FA032), Dec 7, 1984: Swearingen SA226TC (N511SS), Harrison, AR, substantial 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.