# NTSB IAD71II033: Boeing 720, N7207U, Baltimore, MD, January 12, 1971

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: January 12, 1971
- Place: Baltimore, MD · BALTIMORE, MD
- Location: 39.2904° N, 76.6122° W: Placed by OpenAirDocs: center of Baltimore, MD, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=39.2904&lon=-76.6122&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 64 uninjured
- Status: Completed, report September 23, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 160380
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD71II033
- Page: https://openairdocs.org/ntsb/IAD71II033

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0002  71/1/12    BALTIMORE,MD        BOEING 720          CR-  0  0  7  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1857                    N7207U              PX-  0  0 57                            52, 21000 TOTAL HOURS,
                                       DAMAGE-MINOR        OT-  0  0  0                            7600 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          BALTIMORE,MD                DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           ENGINE FAILURE OR MALFUNCTION                            IN FLIGHT: CLIMB TO CRUISE
           FIRE OR EXPLOSION: IN FLIGHT                             IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           POWERPLANT - COMPRESSOR ASSEMBLY: BLADE,COMPRESSOR ROTOR
           MISCELLANEOUS ACTS,CONDITIONS - FATIGUE FRACTURE
           MISCELLANEOUS ACTS,CONDITIONS - FIRE IN ENGINE
        FACTOR(S)
           POWERPLANT - MISCELLANEOUS: FOREIGN OBJECT DAMAGE
        COMPLETE POWER LOSS - COMPLETE ENGINE FAILURE/FLAMEOUT-1 ENGINE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- 8TH STAGE COMPRESSOR BLADE FAILED.CAUSED PROGRESSIVE NR 1 ENG FAILURE.FIRE BOTTLE INOP.LND SAFELY.
```

## Aircraft

- Registration: [N7207U](https://openairdocs.org/deregistered/N7207U-2013-05-06), registration cancelled 2013-05-06, S/N 17913, built 1960 (OpenAirDocs)
- Reported make and model: BOEING 720
- Registry model: [Boeing 720-022](https://openairdocs.org/model/boeing-720-022) (registry code 1383810) (OpenAirDocs)
- Registry engine: [Pratt & Whitney JT3C-4&6](https://openairdocs.org/engine/pratt-whitney-jt3c-4-6) (registry code 52036, turbo-jet) (OpenAirDocs)
- Category: Airplane
- Engines: turbo jet
- Damage: Minor 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.