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Technical Data Sheet
PartsTable / MRO / AA55509-005
AA55509-005 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Verify manufacturer and server generation compatibility Check if Option PN or Spare PN — same part, different channel
Confirm exact part number — similar PNs may be different parts
PRODUCT OVERVIEW

The FUSE,INDICATOR ALARM is a the manufacturer industrial component. Key specifications include unit_type: HAND, level_type: TOPOGRAPHIC ABNEY REFLECTING, hole_diameter: 0.781 INCHES NOMINAL IN, overall_length: 6.000 INCHES MINIMUM AND 8.000 INCHES MAXIMUM IN, outside_diameter: 2.370 INCHES NOMINAL IN, special_features: MODEL R0977AU-COMBO. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 5920-00-857-8909, indicating validated use in U.S.

government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
MRO→ MRO_GENERAL→ AA55509-005
NSN: 5920-00-857-8909
FSC: 5920
CAGE: 58536 — FEDERAL COMMERCIAL ITEM DESCRIPTION PROMULGATED BY GENERAL SERVICES ADMINISTRATION WASHINGTON DC (USA)
SPECIFICATIONS
unit_typeHAND
level_typeTOPOGRAPHIC ABNEY REFLECTING
hole_diameter0.781 INCHES NOMINAL IN
overall_length6.000 INCHES MINIMUM AND 8.000 INCHES MAXIMUM IN
outside_diameter2.370 INCHES NOMINAL IN
special_featuresMODEL R0977AU-COMBO
style_designatorCONCAVE
material_thickness0.300 INCHES NOMINAL IN
sighting_device_typeNONMAGNIFYING
end_item_identificationM4 COMBO FIREARM
spirit_level_sensitivity20 PORM 5 MIN OF ARC FOR 2 MM MOVEMENT MM
arc_graduation_designationINTERCHANGEABLE
NSN5920-00-857-8909
COMPONENT DIAGRAM
COMPONENT MAIN IC EDGE CONNECTOR No detailed specs available FUSE,INDICATOR ALARM TITLE COMPONENT PN AA55509-005 MFR FUSE,INDICATOR ALARM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
GMT18/100Interchangeable
interchangeable cross-reference
interchangeable
401.180Interchangeable
interchangeable cross-reference
interchangeable
AA55509-001Interchangeable
interchangeable cross-reference
interchangeable
GMT1 1-2Interchangeable
interchangeable cross-reference
interchangeable
401 01.5Interchangeable
interchangeable cross-reference
interchangeable
A-A-55509Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AA55509-005?
AA55509-005 is a FUSE,INDICATOR ALARM. It is classified as a MRO (MRO_GENERAL).
What parts can replace AA55509-005?
There are 29 known substitutes for AA55509-005: GMT18/100, 401.180, AA55509-001 and 26 more. Substitute compatibility should be verified for your specific system.
Is AA55509-005 still available?
AA55509-005 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026