AT21689

View detailed technical data, stock status, and sourcing information for: AT21689
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Federal Supply Group

Engine Accessories

Federal Supply Classification

2990 Nonaircraft Miscellaneous Engine Accessories

National Stock Number

2990-00-008-7373

Item Name Code

10849

Assigment Date

07/19/1972 (54 years ago)

19.000 inches nominal overall length, 4.625 inches nominal overall width, 1.752 inches minimum and 1.772 inches maximum 1st outlet outlet inside diameter, unthreaded single inlet inlet connection type, 8.375 inches nominal overall height

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Overall Length: 19.000 inches nominal
Overall Height: 8.375 inches nominal
Overall Width: 4.625 inches nominal
Inlet Connection Type: unthreaded single inlet
Outlet Inside Diameter: 1.752 inches minimum and 1.772 inches maximum 1st outlet
Design Type: dry
Coolant Type: air
Muffler Design: multipass
Baffle Quantity: 2
Tube Quantity: 3
Body Shape: oval
Inlet Location: centrally located in end section of body 2.250 in. c to c above horizontal center line single inlet
Inlet Projection Length: 3.000 inches minimum and 3.250 inches maximum single inlet
Inlet Outside Diameter: 2.600 inches minimum and 2.620 inches maximum single inlet
Inlet Inside Diameter: 2.450 inches minimum and 2.470 inches maximum single inlet
Outlet Connection Type: unthreaded 1st outlet
Outlet Location: centrally located in end section of body 0.500 in. c to c below horizontal center line 1st outlet
Outlet Projection Length: 8.375 inches nominal 1st outlet8.375 inches nominal
Outlet Outside Diameter: 1.850 inches minimum and 1.870 inches maximum 1st outlet
Special Features: inlet pipe has an 80 degree flare at outer end
Material: steel location not otherwise specified
Surface Treatment: paint

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
09707T-10	Exhaust Muffler
AR64102	Exhaust Muffler
AT21689	Exhaust Muffler
T9707	Exhaust Muffler

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 2990-00-008-7373?

The FSCG of the NSN 2990-00-008-7373 is 2990

Does the NSN 2990-00-008-7373 have a Schedule B code assigned?

Yes, the Schedule B code is 8708925000

Does NSN 2990-00-008-7373 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 2990-00-008-7373 contain precious materials?

Precious metal content is unknown

Does NSN 2990-00-008-7373 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 2990-00-008-7373 was assigned to the Federal Catalog?

It was assigned 54 years ago, on Wed, Jul 19, 1972