PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

B1AIndicator,attitude

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 6610-00-557-3120 · FSC 6610 · No Item Name Available
Verified by PartsTable
NSN 6610-00-557-3120 — this item is cataloged by the U.S. Government under National Stock Number 6610-00-557-3120. Primary manufacturer part number: B1A.
Features
  • Indicator,attitude — FSC 6610
  • Supplementary Features: TECH ORDER 5F8-10-3-3
  • Nondefinitive Spec/std Data: B1A TYPE
  • Contact Type: PIN
  • Electrical Connection Quantity: 1
  • Depth: 8.438 INCHES NOMINAL IN
  • Mounting Facility Type and Quantity: 1 THREADED BEZEL
  • Electrical Connection Identifying Number: MS3106A22-14P
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Indicator,attitude, cataloged under National Stock Number 6610-00-557-3120, is classified within Federal Supply Class 6610 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6610-00-557-3120
Primary Part NumberB1A
Item NameIndicator,attitude
FSC / FSG6610 / 66 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Supplementary FeaturesTECH ORDER 5F8-10-3-3
Nondefinitive Spec/std DataB1A TYPE
Contact TypePIN
Electrical Connection Quantity1
Depth8.438 INCHES NOMINAL IN
Mounting Facility Type and Quantity1 THREADED BEZEL
Electrical Connection Identifying NumberMS3106A22-14P
PhaseSINGLE
AC Voltage Rating115.0 VOLTS NOMINAL
Contact Quantity19
Height5.250 INCHES NOMINAL IN
Pointer PurposePITCH AND ROLL OF ACFT; BANK ANGLE
Current TypeAC
Width5.000 INCHES NOMINAL IN
Frequency Rating400.0 HERTZ NOMINAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
6240-00-223-9100 INTERCHANGEABLE
Lamp,glow
4310-00-304-3577B1A INTERCHANGEABLE
Cylinder Head,compressor
Gardner Denver Inc.
6610-00-526-471892160-01 INTERCHANGEABLE
Indicator,attitude
Ge Aviation Systems Llc
4540-01-046-965840-B-1A INTERCHANGEABLE
Parts Kit,garbage Disposal
Standex Intl Corp Dba General Slicing Red Goat Disposers
3436-01-269-7108B-1A INTERCHANGEABLE
Positioner,welding
Air Liquide America Corp Ransome Div
5999-01-512-3035B1A INTERCHANGEABLE
Magnet,permanent
Amphenol (maryland) Inc
3439-01-523-6911 INTERCHANGEABLE
Soldering Station
5999-01-702-2776B1A INTERCHANGEABLE
Contact,electrical
Eaton Aeroquip Llc Dba Jackson North 1 Div Fluid and Electrical Distribution
Cross-Reference Index
Part NumberManufacturer
B1A Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
MILI6501 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6240-00-223-9100INTERCHANGEABLE
LAMP,GLOW
4310-00-304-3577INTERCHANGEABLE
CYLINDER HEAD,COMPRESSOR
B1A
6610-00-526-4718INTERCHANGEABLE
INDICATOR,ATTITUDE
92160-01
4540-01-046-9658INTERCHANGEABLE
PARTS KIT,GARBAGE DISPOSAL
40-B-1A
3436-01-269-7108INTERCHANGEABLE
POSITIONER,WELDING
B-1A
5999-01-512-3035INTERCHANGEABLE
MAGNET,PERMANENT
B1A
3439-01-523-6911INTERCHANGEABLE
SOLDERING STATION
5999-01-702-2776INTERCHANGEABLE
CONTACT,ELECTRICAL
B1A

Frequently Asked Questions

What is NSN 6610-00-557-3120?

NSN 6610-00-557-3120 is a Indicator,attitude, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 6610 (No Item Name Available). Status: active.

What are the part numbers for NSN 6610-00-557-3120?

NSN 6610-00-557-3120 has 2 cross-referenced part numbers: B1A (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), MILI6501 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6610-00-557-3120?

There are 8 known substitutes for 6610-00-557-3120: 6240-00-223-9100, 4310-00-304-3577, 6610-00-526-4718 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of B1A?

Key specifications for B1A: Supplementary Features: TECH ORDER 5F8-10-3-3; Nondefinitive Spec/std Data: B1A TYPE; Contact Type: PIN; Electrical Connection Quantity: 1. 16 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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