This Technical Manual Change 3 for TM 5-6115-227-10 covers the Szekely Model 501 Generator Set, identified under FSN 6115-606-9985, and is dated November 1968. This change was issued for the original TM 5-6115-227-10 manual dated February 13, 1959, making it an important companion document for collectors, researchers, restorers, and anyone building a serious reference library around U.S. Army power-generation equipment and Cold War technical literature.
Unlike a full base manual, this item is an official Change 3 publication. That means it was issued to revise and update the original manual rather than replace it outright. For collectors, that matters. Army manuals were routinely kept current through numbered changes, and surviving change issues help document how operating guidance, maintenance information, and service procedures evolved while the equipment remained in use. In that sense, this is not just a supplemental insert. It is part of the actual service history of the manual.
The Szekely Model 501 Generator Set
The Szekely Model 501 Generator Set belongs to the broader family of military power-generation, utility, and field-support equipment. As identified by its nomenclature, it is a generator set, placing it squarely in the support side of Army operations rather than in the category of conventional weapons or combat vehicles.
Equipment in this class was associated with supplying dependable electrical side of Army operations rather than in the category power for field sites, maintenance areas, support facilities, communications equipment, shop operations, and other mission-essential systems where commercial power was unavailable or unreliable. In military service, generator sets like this were fundamental to keeping installations and mobile operations running.
For collectors, that makes this manual change especially interesting because it documents the technical side of Cold War military support equipment rather than more commonly seen combat hardware. It also has strong crossover appeal for anyone interested in military generators, utility equipment, and U.S. Army field-support systems. The inclusion of FSN 6115-606-9985 adds cataloging value for collectors who prefer manuals with a specific government stock-number reference rather than only general nomenclature.
What This Manual Change Covers
Because this publication is a change to TM 5-6115-227-10, it belongs to the operator-level side of Army documentation. In practical terms, a manual change like this is especially relevant for updated service information related to:
Since this is Change 3 for the February 13, 1959 issue, it is especially useful to collectors who want to pair it with the original base manual and preserve the manual as it was actually updated and used in service.
Historical Significance
The date November 1968 places this publication in the Cold War and Vietnam-era period, while the original February 13, 1959 issue ties the manual back to the late 1950s Army. That gives this change added historical interest because it reflects the continued service life of military generator equipment and the Army’s effort to keep technical literature current as the equipment remained in operational use.
For collectors and historians, this manual change is especially relevant to subjects such as:
Because it covers a specialized generator set rather than a more common tactical vehicle or weapon system, it also adds variety to collections that already include standard ordnance or maintenance manuals.
About This Item
This listing is for Technical Manual Change 3 for TM 5-6115-227-10 covering the Szekely Model 501 Generator Set, identified under FSN 6115-606-9985 and dated November 1968. It was issued for the February 13, 1959 printing of the original technical manual.
It is especially well suited for:
Because manuals were working documents, surviving examples are valued not only for their content, but also for their connection to real military operation, training, and support practice.
Why This Manual Matters
Many military manuals focus only on base editions, but change sheets are a major part of how Army documentation was actually maintained in service. This item adds a layer of authenticity and completeness that a base manual alone does not always provide.
For collectors, it is a useful companion piece to the original TM 5-6115-227-10. For researchers, it helps document the continued operating and service history of the Szekely Model 501 Generator Set. For museums, it adds context to the administrative and technical side of military power-generation equipment that is often overlooked in favor of more visible hardware.
Ideal For
This manual is a strong fit for:
Approx length 10", Approx width 8", Approx height .1", Approx weight 1lbs.
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