Part #: 066-1021-01

Model: KR-21






Marker Beacon Receiver/Lights

Part Number :




  • Crystall controlled marker beacon receiver with 3 light, ACM presentation
  • Lamp self test available (-01 version only)
  • Automatic light dimming
  • 14 or 28 volt operation
  • TSO'd



Size: 3.2"W x 1.050"H x 5.667"L Weight: 0.562 lbs.
Idle Current: 170ma at 13.75V; 120ma at 27.5V Operating Current: 300ma at 13.25V; 250ma at 27.5V
Part Number: Description:
066-1021-00 Black face, 14/28V lighting, without lamp test
066-1021-01 Black face, 14/28V lighting, with lamp test
066-1021-02 Gray face, 14/28V lighting, with lamp test


Serial # 9436
Condition SV
Mods 1
Tag Date 10/25/21
Shop Southeast Aerospace Inc.
Warranty 6 Months
- Marker Receiver

NSN: 5895-01-265-1090

Price Condition Status
- Marker Beacon Receiver
Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.

None, they represent the same unit. Original King Radio part numbers were 9 digits. For example, 066-3056-01. During the Bendix and King merger (i.e. Bendix/King), a new part numbering system was created that converted these 9 digit part numbers to 12 digits. Therefore, 066-3056-01 became 066-03056-0001. Despite this numbering change, units that were originally from the King Radio design still have the 9 digit part number format on the unit dataplate. The 12 digit format for King units appears to be used for catalog and internal Honeywell purposes only. Therefore, any unit that has a zero in its third to last number (i.e. XXX-XXXX-X0XX) has a 9 digit part number (i.e. XXX-XXXX-XXX) on its dataplate / ID Plate.
In January 1989 Bendix/King changed from a nine digit to a twelve digit part numbering system. The new, larger 12 digit numbers allowed for the inclusion of software version into the last two digits of the part number for certain units in which software changed frequently such as EFIS and TCAS processors. Therefore, the two digits immediately preceding the software version indicate the hardware version of the unit.

Different software versions imply different operational features and/or interface capabilities and software modifications imply software repairs (bug fixes) to insure proper operation of these features and interfaces. Software version upgrades frequently require hardware modifications to the unit. Such hardware modifications accompanying software version upgrades do not necessarily change the hardware version of the unit.

Yes, KR-21 units S/N 4051 include Service Aid 102 that enables the KR-21 to drive additional marker lights. In addition, Service Aid 102 can be incorporated to KR-21 units above S/N 1350. The Service Aid involves adding and jumpering wires inside the unit.