# NTSB DEN93LA098: Boeing 757-222, N508UA, Denver, CO, August 2, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: August 2, 1993, 09:47 local (15:47 UTC)
- Place: Denver, CO
- Coordinates: 39.759689, -104.920883 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.7597&lon=-104.9209&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 164 uninjured
- Status: Completed, report November 3, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 18308
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN93LA098
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18308/pdf
- Page: https://openairdocs.org/ntsb/DEN93LA098

## Probable cause

THE FIRST OFFICER'S IMPROPER RECOVERY FROM A BOUNCED LANDING.  FACTORS WERE:  THE FIRST OFFICER'S DELAYED INITIATION OF THE FLARE, AND THE CAPTAIN'S IMPROPER SUPERVISION OF THE FLIGHT.

## Sequence of events

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

- Hard landing, landing - flare/touchdown
  - flare - delayed, copilot/second pilot (contributing factor)
  - recovery from bounced landing - improper, copilot/second pilot (cause)
  - supervision - inadequate, pilot in command (contributing factor)

## Analysis

THE FIRST OFFICER, WHO WAS FLYING THE AIRPLANE, WAS MAKING A VISUAL APPROACH TO RUNWAY 26R.  ALTHOUGH THE APPROACH WAS STABLE FROM 500 FEET, THE LANDING FLARE WAS INITIATED LATE, AND THE AIRPLANE TOUCHED DOWN FIRMLY.  IT BOUNCED SLIGHTLY AND ASSUMED A NOSE HIGH ATTITUDE.  WHEN IT TOUCHED DOWN AGAIN, THE TAIL SCRAPED THE RUNWAY.

## Aircraft

- Registration: [N508UA](https://openairdocs.org/aircraft/N508UA), registered now, S/N 24744, built 1990 (OpenAirDocs)
- Reported make and model: BOEING 757-222
- Registry model: [Boeing 757-222](https://openairdocs.org/model/boeing-757-222) (registry code 1384956) (OpenAirDocs)
- Registry engine: [Pratt & Whitney PW2040](https://openairdocs.org/engine/pratt-whitney-pw2040) (registry code 52121, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 24744
- Airframe hours: 9483
- Engines: P&W 2037 38200 lbs thrust turbo fan
- Damage: Substantial damage
- Flight: Part 121
- Operator: United Airlines
- Registered owner: United Airlines
- Airworthiness certificate: Standard, Transport
- Last inspection: Continuous airworthiness, January 14, 1993, 1,768 hours before
- Departed: PDX, PORTLAND, OR
- Flight plan: IFR
- Airport: DEN, Stapleton International, runway 26, 8,599 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 58; flight instructor, commercial, flight engineer, airline transport; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 8,666 total, 888 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 350° at 14 knots
- Visibility: 60 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point 50 °F
- Altimeter: 30.00 inHg

## 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 19930802031169A](https://openairdocs.org/incident/19930802031169A), Aug 2, 1993: Boeing 757222, Denver, CO, Substantial damage. Bounced on landing. Assumed nose high attitude and dragged tail on runway.

## Other investigations on N508UA (2)

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 SEA08LA061](https://openairdocs.org/ntsb/SEA08LA061), Jan 14, 2008: Boeing 757-222 (N508UA), San Francisco, CA, substantial damage. Probable cause: The company tug operator's failure to maintain clearance with another aircraft during the pushback process. Also causal was the ground controller's failure to alert the pilot of the other aircraft…
- [NTSB DEN93IA027](https://openairdocs.org/ntsb/DEN93IA027), Feb 14, 1993: Boeing 757-222 (N508UA), Grand Junction, CO, incident, no damage. Probable cause: FAILURE OF THE LEFT GENERATOR CONTROL UNIT (GCU), INTEGRATED DRIVE GENERATOR (IDG), RIGHT (SIDE) ENGINE INDICATOR AND CREW ALERT SYSTEM (EICAS), AND BUS TIE BAR (BTB).

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.