KAC-992 064-1029-00

BendixKing - HF Probe Antenna Coupler
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Part Number :

  • Probe/Antenna Coupler used with KHF-990 Helicopter HF system
  • Used in conjunction with KTR-993 Transceiver and KFS-594 control
  • Whip antenna attached to coupler
  • Includes operational features such as rapid antenna tuning, maximum transmission efficiency and high reliability through elimination of maintenance-intensive mechanical assemblies
  • Hermetically sealed allowing it to be mounted either totally external or with coupler section mounted internally and antenna protruding through clearance hole in aircraft skin
Size (coupler): 3.7" diameter x 27.4"L Size (antenna): 1.25" diameter x 100"L
Environmental: F2/A/JLMVY/ERFXXSA/BZ/AB/BZ/A Temperature Range: -55C to +70C
TSO: FAA TSO C-31c and C-32c; RTCA DO-160A and DO-163 Altitude: to 55,000 feet
Weight (antenna): 1.0 Weight (coupler): 7.8 lbs.
Part NumberHF Probe/Antenna Coupler Description:
064-1029-00 28VDC Standard version for aircraft applications
064-1029-01 14VDC version for marine or mobile applications


- HF Probe Antenna Coupler
Price Condition Delivery

SEA Repair Capabilities: Yes

- Antenna Coupler
Price Condition Delivery

SEA Repair Capabilities: Yes

- HF Antenna Coupler
Price Condition Delivery

SEA Repair Capabilities: Yes

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

The KAC-992 probe antenna coupler is a unique piece of equipment in that it is mounted on the exterior of the aircraft. Therefore, it is exposed to the severe elements experienced in flight. When they were manufactured, the dataplate was attached to the exterior of the unit with no special consideration for this exposure. The manufacturer also placed the dataplate in a position on the coupler that is directly in line with the rear attaching clamp. Because of these two conditions, the dataplate falls off and is lost in most cases.

The manufacturer will not issue new dataplates even though they are aware of this unfortunate circumstance. Therefore, the market is left with functioning and useful units that cannot be certified with an FAA approved maintenance release because the dataplate is missing and no method exists to obtain a new one.

Can the KAC-992 probe antenna coupler be used with a KHF-950 system?

No. The following is a detailed explanation of some of the technical aspects within the KHF-950 and KHF-990 that prevent the KAC-992 from being used in the KHF-950 system.

The standard KHF-950 consists of the KCU-951 Control, KTR-953 Receiver Exciter, and KAC-952 Power Amplifier/Coupler.

In the transmit mode of operation, the KTR-953 provides a low power (milliwatts) signal (at the selected frequency) to the KAC-952. This excitation signal is amplified in the KAC-952 to provide the rated output power (watts). The power amplifier is contained in the KAC-952. The KAC-952 also tunes the antenna to the desired frequency by electronically varying the antenna’s length.

The standard KHF-990 system consists of a KFS-594 control, KTR-993 R/T, and KAC-992 probe antenna coupler.

The receiver/exciter and power amplifier is contained in the KTR-993. The output of the KTR-993 is the amplified RF signal at the rated power (watts). The KAC-992 is strictly an antenna tuner and provides no amplification. Also, the KTR-953 would not provide the commands required to initiate the tuning cycle.

If the KTR-953 was installed with a KAC-992, the output of the KTR-953 would not supply adequate power to drive the KAC-992. Even if it was able to tune, the output power would be millwatts (1/1000) instead of a hundred watts.
Southeast Aerospace exchanges are based on the return of an undamaged, economically repairable core unit with identical part number as the unit shipped to the customer. An "economically repairable" core is defined as one where the cost to repair/overhaul (or Repair Cap) does not exceed 80% of the original SV/OH exchange price billed. Should the Repair Cap exceed 80%, the customer will be billed the additional amount. In the event this amount exceeds the Outright Price for the unit, the customer would only be billed the difference between the Outright Price and SV/OH Exchange Price with the core returned as-is to the customer.

Here is an example of such a transaction:

$1000 Exchange Price charged to customer
$1000 x .8 = $800 Maximum Allowable core repair charge or Repair Cap

$2000 Cost to repair core unit
- $800 Less Core repair cap
$1200 Additional billing amount.

2200.00 Total Cost of transaction

Please Note:
SEA offers exchange on new items as well. However, repair cap as indicated above is still based on SV/OH exchange price.
In most cases, a Supplemental Type Certificate is not required for the installation of an HF system. Major changes or alterations to an aircraft may include those which affect weight, balance, structural aspects, reliability, operational characteristics, airworthiness characteristics, etc. Some major alterations can be performed using the FAA Form 337 with approved data. This approved data can be in the form of engineering data with a FAA designee approval (i.e. DER, DAR). The DER or DAR then issues an FAA Form 8110 which is considered approved data adequate to proceed with the installation.

HF installations in the USA are installed and approved in the method detailed above. STCs are not required for almost all HF installations since the change to the existing aircraft Type Certificate (TC) is not so intensive as to require one.