Description
Technical Manual (TM 9-1240-211-35) for M90C, M90D, M90F, and XM128 Straight Telescopes July 1968
This Technical Manual TM 9-1240-211-35 covers the M90C, M90D, M90F, and XM128 Straight Telescopes and is dated July 1968.
The publication is a direct support, general support, and depot maintenance reference that includes repair parts and special tool lists for four U.S. Army optical fire-control instruments.
Historical Significance
The telescope models documented in this manual served several distinct Cold War-era aiming and alignment roles. The M90C was intended for the 105 mm M27A1 Recoilless Rifle, while the M90D was used with the 75 mm M20 Recoilless Rifle.
The M90F supported alignment of the HAWK missile launcher and was also used with the M36 Radar Chronograph. The XM128, separately designated as an Army straight telescope in 1967, appears here alongside the established M90 variants in a consolidated higher-level maintenance publication.
What This Manual Covers
TM 9-1240-211-35 addresses maintenance of the four straight-telescope models at the direct support, general support, and depot levels. Its scope is intended for personnel responsible for maintaining and repairing these instruments beyond operator-level service.
The included repair-parts and special-tools information supports component identification, supply planning, and selection of the tools required for authorized maintenance. Model-specific Federal Stock Numbers help distinguish telescopes that performed different aiming and alignment duties.
Key Features
- Official publication number: TM 9-1240-211-35
- Publication date: July 1968
- Equipment covered: M90C, M90D, M90F, and XM128 Straight Telescopes
- Maintenance scope: direct support, general support, and depot maintenance
- Included reference material: repair parts and special tool lists
- M90C Federal Stock Number: 1240-764-8432
- M90D Federal Stock Number: 1240-759-7853
- M90F Federal Stock Number: 1240-601-4065
- XM128 Federal Stock Number: 1290-087-5527
Why This Manual Matters
This publication brings four related but differently applied Army telescopes into one maintenance reference. It preserves the official model designations, stock numbers, maintenance levels, parts terminology, and special-tool context needed to distinguish and support the instruments.
It is especially relevant to research involving the M27A1 and M20 recoilless rifles, HAWK missile-system support equipment, the M36 Radar Chronograph, and the development of U.S. Army optical fire-control maintenance during the 1960s.
About This Manual
Published by Headquarters, Department of the Army in July 1968, TM 9-1240-211-35 is a direct support, general support, and depot maintenance manual with repair-parts and special-tool coverage for the M90C, M90D, M90F, and XM128 Straight Telescopes.
Ideal For
This manual is a strong fit for:
- U.S. Army technical-manual collectors
- Military optics and fire-control researchers
- Recoilless-rifle restoration and display projects
- HAWK missile-system and radar-equipment historians
- Military museums and reference libraries
Approx length 8", Approx width 10", Approx height .2", Approx weight .2 lbs.
Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item's general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures.
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