Manufacturer: Kollsman Instrument Corporation

Model: AAU-21/A

MFR Part Number: C4154210003

Serial No: CKP 1595 [SELLER TO CONFIRM]

Contract: N00019-68-C-0409

FSN: VH6610-168-0797 BP7X

Altitude Range: −1,000 to +38,000 FT

Country: United States

Form: Round panel-mount, large multi-pin (~30-pin) rear connector, static port

Combined primary altimeter + Mode C encoder from Kollsman. AAU-21/A is a well-known military altimeter-encoder installed on many military aircraft and older business jets. High-value item due to combined altimeter/encoder function.

[SELLER TO CONFIRM before publishing: full serial from Kollsman logo, PN verification, encoder function test, static port condition, connector pin condition.]

Cosmetic wear as shown. Sold as-is — buyer assumes responsibility for testing, IA/A&P inspection, and any overhaul before airworthy use.