Description
Technical Manual Change 1 (TM 9-1240-239-35P) for M28/T46, M28C, and M28D Tank Periscopes October 1966
This Technical Manual Change 1 TM 9-1240-239-35P updates the repair-parts and special-tools manual for the M28/T46, M28C, and M28D Tank Periscopes and is dated 24 October 1966.
Issued for use with the original TM 9-1240-239-35P dated 14 February 1961, this official change notice expands the publication's model coverage, updates Army maintenance terminology, and revises support information for the three optical instruments.
Historical Significance
The M28-series periscopes were monocular optical sighting instruments used as components of armored-vehicle fire-control systems. Their applications extended across tanks, armored personnel carriers, self-propelled mortars, and flame-thrower vehicles during the early Cold War.
Change 1 records the Army's transition from older echelon-based maintenance terminology to direct support, general support, and depot maintenance language. It also formally incorporates the M28D into the parts publication alongside the M28/T46 and M28C.
Updated Periscope and Vehicle Applications
The change notice supersedes the publication's special-information and application footnotes with model-specific vehicle assignments:
- M28/T46: M59 armored personnel carrier with preferred M13 cupola; M84 4.2-inch self-propelled mortar; and M48A1 and M48A2 90 mm gun tanks
- M28C: M67A1 Army and M67A2 USMC flame-thrower vehicles; M48A2C and M48A3 90 mm gun tanks; and M60 and M60A1 105 mm gun tanks
- M28D: M132 and M132A1 self-propelled flame-thrower vehicles
What This Manual Covers
This change notice amends the field- and depot-maintenance repair-parts and special-tools list for the M28-series tank periscopes. It changes the title and maintenance-level terminology, adds the M28D wherever the M28/T46 and M28C are referenced, removes the obsolete Technical Service number column, and replaces selected special-information and footnote content.
As an official change notice, it supplies amendments to the 1961 base parts manual rather than reproducing the complete manual. Its pages are intended to be used with TM 9-1240-239-35P.
Key Features
- Official publication: TM 9-1240-239-35P, Change 1
- Change date: 24 October 1966
- Original manual date: 14 February 1961
- Equipment covered: M28/T46, M28C, and M28D Tank Periscopes
- Federal Stock Numbers: 1240-346-8735, 1240-706-0794, and 1240-990-1851
- Maintenance scope: direct support, general support, and depot repair parts and special tools
- Publication type: official Department of the Army change notice
Why This Manual Matters
Change 1 is a focused primary-source reference for understanding how the Army supported and cataloged three related armored-vehicle periscopes. It preserves the official model assignments, Federal Stock Numbers, and revised maintenance terminology used for parts identification and supply support.
For owners of the 1961 base manual, this notice provides the amendments that added M28D coverage and updated the publication for later M48, M60, and specialized armored-vehicle applications.
About This Manual
Published by Headquarters, Department of the Army on 24 October 1966, this is Change 1 to TM 9-1240-239-35P. It updates the repair-parts and special-tools list issued on 14 February 1961 and is not the complete base manual.
Ideal For
This manual change is a strong fit for:
- U.S. Army technical-manual collectors
- M48 and M60 tank researchers and restorers
- M59 armored personnel carrier and M84 mortar carrier researchers
- M67 and M132 flame-thrower vehicle researchers
- Military optics and armored fire-control specialists
- Museums, archives, and military reference libraries
Approx length 8", Approx width 10", Approx height .1", Approx weight .1lbs.
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