# NTSB CHI76IC005: Boeing 747, N4717U, Chicago, IL, July 17, 1975

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: July 17, 1975
- 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: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 359 uninjured
- Status: Completed, report August 19, 1975
- Report: Brief approved by the director
- NTSB case key (mKey): 150389
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI76IC005
- Page: https://openairdocs.org/ntsb/CHI76IC005

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0008  75/7/17    CHICAGO,IL          BOEING 747          CR-  0  0 17  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1355                    N4717U              PX-  0  0342                            UNK/NR, UNK/NR TOTAL
                                       DAMAGE-MINOR        OT-  0  0  0                            HOURS, UNK/NR IN TYPE,
                                                                                                   INSTRUMENT RATED.
        CLASSIFIED AS INCIDENT
        OPERATOR - UNITED AIR LINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          CHICAGO,IL                  HONOLULU,HI
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           AIRFRAME FAILURE: IN FLIGHT                              IN FLIGHT: CLIMB TO CRUISE
        PROBABLE CAUSE(S)
           AIRFRAME - WINGS: SKIN AND ATTACHMENTS
           MISCELLANEOUS ACTS,CONDITIONS - MATERIAL FAILURE
        FACTOR(S)
           MISCELLANEOUS - FOREIGN OBJECT DAMAGE
           MISCELLANEOUS ACTS,CONDITIONS - PREVIOUS DAMAGE
           MISCELLANEOUS ACTS,CONDITIONS - SEPARATION IN FLIGHT
        REMARKS- APRX 1/3 OF L WNG TRAILING EDGE PNL SEPD.RETURNED & LNDD OK.SHOE PRINTS VISIBLE ON FORE FLAP.
```

## Aircraft

- Registration: [N4717U](https://openairdocs.org/deregistered/N4717U-1998-02-12), registration cancelled 1998-02-12, S/N 19878 (OpenAirDocs)
- Reported make and model: BOEING 747
- Registry model: [Boeing 747-122](https://openairdocs.org/model/boeing-747-122) (registry code 1384872) (OpenAirDocs)
- Category: Airplane
- Engines: turbo fan
- Damage: Minor damage

## Other investigations on N4717U (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 CHI83IA269](https://openairdocs.org/ntsb/CHI83IA269), Jun 20, 1983: Boeing B-747 (N4717U), Chicago, IL, incident, 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.

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