Part #: 066-1061-03

Model: KRA-10A






Radio Altimeter R/T

Part Number :




  • Solid-state Radar Altimeter Receiver/Transmitter Unit
  • Operates on 28 volt primary power
  • Can be operated on 14V with KA-133 adapter
  • Used with KI-250 indicator and KA-131 antenna
  • May be mounted in any position, with or without shock mounts, at a distance of not more than 2 ft. from antenna
  • Has auxiliary analog output for use by Flight Directors and Autopilots
  • Digital altitude processor for long, drift-free operation
  • Rugged, die-cast construction


Size: 3.1"W x 3.51"H x 8.0"L Weight: 2.0 lbs.
Altitude: 45,000 ft. Temperature: -54°C to +71°C
Power Requirements: +27.5 VDC ± 20% @ 200mA max total for system Mounting: Any position - shock or hard
Cooling: Convection Vibration: .02" excursion from 5 to 55 Hz 3g from 55Hz to 2000Hz
Altitude Output Range: 20 ft. to 2,500 ft. max AGL Accuracy: +-5 ft. 50-100 ft.; +-5% 100-500 ft.; %7 500-2000 ft.
Part Number: Description:
066-1061-03 Radio Altimeter R/T


Serial # 14012
Condition OH
Mods 1-2
Tag Date 06/27/24
Shop Southeast Aerospace Inc.
Warranty 6 Months
Serial # 17531
Condition OH
Mods 1-2
Tag Date 06/12/24
Shop Southeast Aerospace Inc.
Warranty 6 Months
- Radio Altimeter R/T

NSN: 5821-01-392-4585

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.

The KRA-10A includes an optional altitude inhibit function. When connected to a strut or speed switch, the KRA-10A will prevent the KI-250 needle from being in view when there is a possibility of reflections from nearby objects while taxiing on the ground. The KRA-10 does not have the optional altitude inhibit feature.
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.
In civilian aviation, these two terms are used interchangeably and essentially mean the same. They both can be abbreviated as "Rad Alt" sometimes as well.

This system measures the between an aircraft and the ground directly below it. "Radar" or Radio Detection and Ranging is the principle by which the system operates. That is, a signal is transmitted towards the ground and then received back for processing. The time the signal takes to reflect back to the aircraft is timed and this is how the altitude is measured. The signal that is transmitted is a radiowave. Thus, this is perhaps this is the reason why some may use the term "Radio Altimeter" instead of "Radar Altimeter".

Negotiating the exchange price of a unit only limits the allowable repair cap for the core unit. Southeast Aerospace's exchange transactions are based on the return of economically repairable core unit. Once the core is received and evaluated, the core repair cost incurred by SEA cannot exceed 75% of the original exchange price. That is, it cannot cost SEA more than 75% of the original OH/SV exchange price collected from the customer. Therefore, when and if an SEA exchange price is discounted, there is a risk that additional charges may be assessed once the core is returned and evaluated.

See chart below or view in PDF format: Radar Altimeter System Comparison (PDF)