Part #: 066-1071-00

Model: KXP-756




ATC Transponder

Part Number :

  • All Solid State Class 1A, 4096 codes Transponder
  • Altitude reporting
  • Used with KFS-576 and KFS-576A frequency selector which displays codes in gas discharge numerics.
  • 250 watts
  • 28VDC
  • TSO'd
Size: 2.00"W x 5.275"H x 11.750"L Weight: 3.81 lbs.
Receiver Frequency: 1030 MHz, crystal controlled Temperature Range: -55C to +70C
Transmitter Frequency: 1090 MHz +-3 MHz Altitude: to 70,000 feet
TSO Compliance: C74c, Class 1A, Env. Cat. DO-160.A2E1/A/MNO/EXXXXXSZAAAA Applicable Documents: RTCA Document DO-160
Design: All solid-state, electronically tuned by single-crystal and single chip LSI digital frequency synthesizer Receiver Sensitivity: -73 dbm for 90% reply, nominal
Power Requirements: 11-33 VDC; 1.4 amps at 27.5 VDC Side Lobe Suppression: 3 pulse
Suppression Input: Accepts +10 through +70V pulses Suppression Output: Provides a minimum 18V, maximum 55V 35 us pulse
Part NumberATC Transponder Description
066-1071-00 see above


Serial # 6880
Condition OH
Mods 1-3
Tag Date 11/07/23
Shop Southeast Aerospace Inc.
Warranty 6 Months
- ATC Transponder
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, anytime a transponder is removed or replaced an altitude correlation between what the transponder is reporting and what is displayed on the altimeter needs to be performed. This is outlined in FAA CFR Part 91.413. This regulation indicates that following any installation or maintenance of a transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with paragraph (c), appendix E. Furthermore, these references indicate that an integration test between the altitude reporting equipment and transponder system must be conducted.

For complete information, please refer to these FAA regulations or contact Southeast Aerospace Tech Support team at

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.