# NTSB LAX89LA231: Boeing A75, N747JR, Sacramento, CA, July 6, 1989

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: July 6, 1989, 14:45 local (21:45 UTC)
- Place: Sacramento, CA
- Coordinates: 38.50999, -121.490356 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.5100&lon=-121.4904&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report August 2, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 26440
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX89LA231
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/26440/pdf
- Page: https://openairdocs.org/ntsb/LAX89LA231

## Probable cause

THE PARTIAL BLOCKAGE OF THE ENGINE INDUCTION SYSTEM WHICH RESULTED FROM IMPROPER MAINTENANCE.

## Sequence of events

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

- Loss of engine power, takeoff - initial climb
  - induction air control/system - blocked(partial) (cause)
  - maintenance - improper, other maintenance personnel (cause)
- Forced landing, descent - emergency
- In flight collision with object, approach - vfr pattern - final approach
  - object - building(nonresidential) (contributing factor)

## Analysis

SHORTLY AFTER TAKEOFF, THE ENGINE STARTED LOSING POWER. THE PILOT DECLARED AN EMERGENCY AND WAS CLEARED TO LAND ON ANY RUNWAY. THE AIRPLANE MADE THE AIRPORT BUT COLLIDED WITH A HANGAR, AND THEN THE GROUND. POST ACCIDENT INSPECTION REVEALED THE AIR INDUCTION SYSTEM APPEARED TO BE BLOCKED WITH A LARGE AMOUNT OF FRICTION TAPE. ANOTHER JUNCTION IN THE INDUCTION SYSTEM WAS WRAPPED WITH THE SAME TYPE FRICTION TAPE.

## Aircraft

- Registration: [N747JR](https://openairdocs.org/deregistered/N747JR-2012-06-26), registration cancelled 2012-06-26, S/N 75-3885, built 1942 (OpenAirDocs)
- Reported make and model: BOEING A75
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018, reciprocating) (OpenAirDocs)
- Category: Airplane
- Engines: CONTINENTAL 220C 220 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Red Max, Inc.
- Airworthiness certificate: Standard, Aerobatic
- Departed: SAC
- Airport: SAC, Executive

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 65; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 5,814 total, 98 in this make and model, 3,800 as pilot in command, 22 in the last 90 days, 3 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 20 statute miles
- Temperature: 97 °F, dew point 41 °F
- Altimeter: 29.00 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 19890706020169A](https://openairdocs.org/incident/19890706020169A), Jul 6, 1989: Boeing A75N1, Sacramento, CA, Substantial damage. Engine quit on initial climbout. Struck a hangar returning to land. Cloth tape used patch airduct blocked same.

## Other investigations on N747JR (3)

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 LAX88LA178](https://openairdocs.org/ntsb/LAX88LA178), May 11, 1988: Boeing A75N1 (N747JR), Sacramento, CA, substantial damage
- [NTSB LAX84IA014](https://openairdocs.org/ntsb/LAX84IA014), Oct 15, 1983: Boeing A75N1 (N747JR), Woodland, CA, incident, minor damage
- [NTSB LAX80DVG63](https://openairdocs.org/ntsb/LAX80DVG63), Aug 1, 1980: Boeing A75N1 (N747JR), Sacramento, CA, substantial 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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