# NTSB CHI70AC083: Boeing 727, N7414U, Chicago, IL, May 18, 1970

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Closed
- Date: May 18, 1970
- Place: Chicago, IL · CHICAGO, IL
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 2 minor, 69 uninjured
- Status: Completed, report February 16, 1971
- Report: Brief approved by the director
- NTSB case key (mKey): 125134
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI70AC083
- Page: https://openairdocs.org/ntsb/CHI70AC083

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
1-0036  70/5/18    CHICAGO,ILL         BOEING 727          CR-  0  0  7  SCHED DOM PASSG SRV       ATP,FLIGHT INSTR., AGE
        TIME - 1210                    N7414U              PX-  0  1 64                            41, 19888 TOTAL HOURS,
                                       DAMAGE-NONE         OT-  0  0  0                            3187 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        NAME OF AIRPORT - O'HARE
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION         LAST ENROUTE STOP
          FRESNO,CALIF                NEWARK,N.J.                  DENVER,COLO
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           FIRE OR EXPLOSION: ON GROUND                             TAXI: FROM LANDING
        PROBABLE CAUSE(S)
           AIRFRAME - FLIGHT CONTROL SURFACES: FLAP ASSEMBLIES
           SYSTEMS - HYDRAULIC SYSTEM: RESERVOIR,LINES,FITTINGS
           MISCELLANEOUS ACTS,CONDITIONS - LEAK/LEAKAGE
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  SUSPECTED MECHANICAL DISCREPANCY
        REMARKS- FLAP SELECTOR VALVE LEAKED HYD FLUID ON APU EXHAUST.SMOKE ENTERED CABIN THRU VENTS.PAX INJURY EVAC
```

## Aircraft

- Registration: N7414U (not matched to a registry record)
- Reported make and model: BOEING 727
- Category: Airplane
- Engines: turbo fan
- Damage: No damage
- Airport: O'Hare

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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