Description
Technical Manual Change 1 (TM 9-1240-239-35) for M28/T46, M28C, and M28D Tank Periscopes December 1966
This Technical Manual Change 1 TM 9-1240-239-35 updates the maintenance manual for the M28/T46, M28C, and M28D Tank Periscopes and is dated 15 December 1966.
The change applies to the original TM 9-1240-239-35 dated 17 August 1960. It expands the manual's title and model coverage while updating maintenance terminology, equipment applications, references, and selected technical information.
Historical Significance
The M28-series periscopes were monocular optical sighting instruments used as components of armored-vehicle fire-control systems. The different models supported personnel carriers, self-propelled mortars, gun tanks, and mechanized flame-thrower vehicles during the Cold War era.
Change 1 records an important administrative and technical update to the manual. It replaces the older term field maintenance with direct support and general support, and it broadens references from the M28C alone to the M28/T46, M28C, and M28D models.
Updated Model and Vehicle Applications
The change supplies revised application information for each periscope model and identifies the vehicles whose fire-control systems used them.
- M28/T46, FSN 1240-346-8735: M59 full-tracked armored personnel carrier with the preferred M13 cupola, M84 4.2-inch self-propelled mortar, and M48A1 and M48A2 90 mm gun tanks
- M28C, FSN 1240-706-0794: M67A1 and M67A2 flame throwers, M48A2C and M48A3 90 mm gun tanks, and M60 and M60A1 105 mm gun tanks
- M28D, FSN 1240-990-1851: M132 and M132A1 mechanized flame throwers
What This Manual Covers
This official change notice revises the title, scope, description, nomenclature, and selected maintenance references in TM 9-1240-239-35. It directs users to replace references to the periscope sight M28C with the expanded designation M28/T46, M28C, and M28D throughout the base manual.
The update also changes the referenced periscope mount from M104A1 to M104A1 and M104A2, and replaces the older ORD 8 SNL F402 parts reference with TM 9-1240-239-35P.
The revised description identifies all three models as monocular optical sighting instruments serving as fire-control-system components. Additional changes address the maintenance scope, related vehicle manuals, and specific component nomenclature.
As a Change 1 publication, this document supplies amendments to the August 1960 base manual and is not the complete TM 9-1240-239-35 maintenance manual.
Key Features
- Official publication number: TM 9-1240-239-35, Change 1
- Change date: 15 December 1966
- Original manual date: 17 August 1960
- 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 maintenance
- Publication type: official change notice for the base technical manual
Why This Manual Matters
Change notices preserve corrections and revised instructions that are not present in the original edition by itself. This publication documents how the Army expanded TM 9-1240-239-35 to cover three related periscopes and updated its maintenance language and equipment references.
It is a focused reference for identifying the correct periscope model, stock number, vehicle application, mount, and related parts publication used with the updated manual.
About This Manual
Issued by the Headquarters, Department of the Army on 15 December 1966, this is Change 1 for TM 9-1240-239-35, originally dated 17 August 1960.
The publication updates the direct-support, general-support, and depot-maintenance manual for the M28/T46, M28C, and M28D Tank Periscopes. It must be used with the base manual and does not replace the complete manual.
Ideal For
This manual change is a strong fit for:
- U.S. Army technical-manual collectors
- M48 and M60 tank restoration researchers
- M59 personnel-carrier and M84 mortar historians
- M67 and M132 mechanized flame-thrower researchers
- Military optics and fire-control reference collections
- Museums, archives, and restoration libraries
Approx length 8", Approx width 10", Approx height .1", Approx weight .1lbs.
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