# NTSB IAD71II041: Boeing 727, N491US, Washington, DC, March 13, 1971

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Closed
- Date: March 13, 1971
- Place: Washington, DC · WASHINGTON, DC
- Location: 38.8951° N, 77.0364° W: Placed by OpenAirDocs: center of Washington, DC, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=38.8951&lon=-77.0364&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 22 uninjured
- Status: Completed, report July 20, 1972
- Report: Brief approved by the director
- NTSB case key (mKey): 161315
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=IAD71II041
- Page: https://openairdocs.org/ntsb/IAD71II041

## NTSB brief

```
----------------------------------------------------------------------------------------------------------------------------
 FILE    DATE          LOCATION          AIRCRAFT DATA       INJURIES       FLIGHT                        PILOT DATA
                                                               F  S M/N     PURPOSE
----------------------------------------------------------------------------------------------------------------------------
4-0025  71/3/13    WASHINGTON,DC       BOEING 727          CR-  0  0  6  SCHED DOM PASSG SRV       AIRLINE TRANSPORT, AGE
        TIME - 1545                    N491US              PX-  0  0 16                            38, 10200 TOTAL HOURS,
                                       DAMAGE-NONE         OT-  0  0  0                            3250 IN TYPE, INSTRUMENT
                                                                                                   RATED.
        CLASSIFIED AS INCIDENT
        NAME OF AIRPORT - WASHINGTON NATL
        OPERATOR - NORTHWEST AIRLINES,INC.
        DEPARTURE POINT             INTENDED DESTINATION
          WASHINGTON,DC              UNKNOWN/NOT REPORTED
        TYPE OF ACCIDENT                                         PHASE OF OPERATION
           MISCELLANEOUS                                            TAKEOFF: INITIAL CLIMB
        PROBABLE CAUSE(S)
           SYSTEMS - FLIGHT CONTROL SYSTEMS: OTHER
        EMERGENCY CIRCUMSTANCES - PRECAUTIONARY LANDING ON AIRPORT
                                  PITCH CONTROL PROBLEM
        REMARKS- ELEVTR CTLS SLOPPY,ERRATIC,LARGE INPUTS REQD.NO CAUSE FOUND,UN DUPE PROBLEM DURG INVEST.
```

## Aircraft

- Registration: N491US (not matched to a registry record)
- Reported make and model: BOEING 727
- Category: Airplane
- Engines: turbo jet
- Damage: No damage
- Airport: Washington Natl

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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