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Title Northwest Airlines Allison Borescope
Date ca. 1959
Collection Northwest Airlines Airport, Office & TechOps Items
Object Name Borescope
Catalog Number 2014.143.1
Description Borescope with attachment parts, including light, in original wood box. Made by Allison Engine Company. Manufacturer numbers: Serial Number 90071, Part Number 6797314. Northwest Stk# 00-2001-0-0049.
Artist/Maker Allison Engine Company
Provenance Tool used by Northwest Airlines aircraft maintenance technicians (AMTs) to examine the inside of an Allison T56-A-1 (501-D13) turboprop aircraft engine. Northwest Airlines used this engine, initially designed for the Lockheed C-130, on its Lockheed L-188 Electra aircraft. Northwest Airlines flew the Electra prop-jet from 1959-1972.

The borescope was a Northwest Airlines invention that made easier inspections of engines possible. A 1950s Northwest Airlines mechanic developed a probe to check conditions inside an aircraft engine without opening it up. The test model worked well inserted through an engine's spark plug hole. Today's jet engines are made with special accesses for a boroscope to view blades, vanes and other internal parts.
Search Terms Northwest Airlines
Allison Engine Company
Rolls Royce
Allison T56-A-1 (501-D13)
Lockheed 188C Electra
Subjects Airplane engines
Aircraft maintenance
Tools
Mechanics (Persons)
Credit line Delta Air Lines