# NTSB FTW85IA149: Beech A36, N2057A, Dfw Airport, TX, March 13, 1985

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: March 13, 1985, 09:15 local (15:15 UTC)
- Place: Dfw Airport, TX
- Location: 32.9550° N, 97.0329° W: Placed by OpenAirDocs from NTSB’s distance and direction from DALLAS-FORT WORTH INTL (DFW), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.9550&lon=-97.0329&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21589
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85IA149
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21589/pdf
- Page: https://openairdocs.org/ntsb/FTW85IA149

## Sequence of events

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

- Vortex turbulence encountered, approach - iaf to faf/outer marker (ifr)
  - instructions,written/verbal - inadequate, atc personnel(dep/apch) (cause)
  - radar separation - inadequate, atc personnel(dep/apch) (cause)

## Analysis

DRG ARR, A BEECH A36, N2057A, WAS VECTORED FOR AN ILS RWY 17L APCH WHILE A HVY BOEING 747 WAS BEING VECTORED FOR AN ILS RWY 18R APCH. THE ATC ARRIVAL CONTROLLER (CTLR) STATED HE HAD 'STAGGERED' THE A36 BHND THE 747 WITH AT LEAST 3 MI SEPN. AFTER THE A36 WAS INBND ON THE ILS LOCALIZER (LOC), IT ENCOUNTERED WAKE TURBC FROM THE 747, BUT THE PLT RECOVERED & LNDDSAFELY. INV REVEALED THAT AS THE 747 WAS APCHG THE ILS 18R LOC FM THE WEST, ITS CREW WAS TOLD TO MAKE A 'HARD RGT TURN' TO JOIN THE LOC. DRG THE TURN, THE 747 DSCNDD FM 5700' TO 4100', THEN CONTD DSCNDG TO 3000' WHILE INBND ON THE APCH. RADAR DATA SHOWED THAT THE CTLR HAD DELAYED THE 747'S VECTOR TO THE 18R LOC & THAT THE 747 OVERSHOT ITS LOC & CONVERGED TO WITHIN 600' OF THE 17L LOC. AS THE A36 TURNED TO INTERCEPT THE 17L LOC, IT HAD AN INTERVAL OF APRX 90 SEC BEHIND THE 747. THERE WAS EVIDENCE THAT THE WING TIP VORTICES FM THE 747 HAD SETTLED AT A RATE OF 400 TO 600 FT/MIN & DRIFTED TWD THE A36'S FLT PATH. PROCEDURES REQD 5 MI SEPN WHEN A SMALL ACFT WAS FLWG DIRECTLY BHND & WITHIN 1000' BLO A HVY JET.

## Aircraft

- Registration: [N2057A](https://openairdocs.org/aircraft/N2057A), registered now, S/N E-1420, built 1978 (OpenAirDocs)
- Reported make and model: BEECH A36
- Registry model: [Beech A36](https://openairdocs.org/model/beech-a36) (registry code 1151604) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: E1420
- Engines: CONTINENTAL IO-520-AB 285 horsepower reciprocating
- Damage: No damage
- Flight: Business, Part 91
- Operator: John Seale
- Airworthiness certificate: Standard, Normal
- Departed: JAS, JASPER, TX
- Flight plan: IFR
- Airport: DFW, Dfw Airport, runway 17L, 11,388 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 29; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: helicopter, airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 170° at 17 knots
- Visibility: 8 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 66 °F, dew point 61 °F
- Altimeter: 29.00 inHg
- Observed at: DFW

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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