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Part #:

Model: RT-300

OEM:

Honeywell

Desc:

Radio Altimeter Transceiver
Part Number :
Honeywell Logo

 
RT-300
FEATURES
  • Radar altimeter transceiver utilized in AA-300 Radio Altimeter System
  • Used to measure the altitude Above Ground Level (AGL)
  • Can be hard mounted to aircraft or mounted in shock isolated tray
  • Precision altitude output used to drive primary radio altitude display in up to five RA-315 or RA-335 indicator or EFIS displays
  • Auxiliary altitude output is ARINC 552 signal used to drive rising runway bar in any Honeywell Altitude Director Indicator
  • In -9X1/-9X3/-9X4/-9X5 units, auxiliary output is limited to 0-500 foot range
  • In -9X2/-9X6/-9X7/-9X8 units, auxiliary output is full scale ARINC 552 (0-2500 feet)
  • Four trip point outputs available that provide a ground when system determines it is at or below the altitude associated with trip point
  • Pilot Activated Self Test (PAST) input available to verify system operation
  • Two separate inputs provided to inhibit self-test operation and may be used to prevent self-test when aircraft flight control system is engaged
  • Valid output signifies system status and separate logic output indicates when unit is tracking return signal
  • -91X,-92X, and -93X units have incorporated products improvements to improve ability to operate in condition of excessive antenna leakage and interference signals
  • -93X units have improved HIRF immunity by way of added filtered connector to provide more RF filtering
  • -90X models out of production

 

SPECIFICATIONS

Dimensions: 4.56"W x 4.09"H x 11.07"D Weight: 4.6 lbs.
TSO: C-87, RTCA DO-160A Power Requirements: 21.32 VDC, 0.7 amp max
Temperature: -55C to 70C Altitude: 55000 ft.
Power Output: 5 watts nominal RF Freq.: 4.3 GHz
Operation Altitude: 0-2500 ft. IF Freq.: 60 MHz
Part Number: Description:
7001840-901 See Attachment Below
7001840-902 See Attachment Below
7001840-903 See Attachment Below
7001840-905 See Attachment Below
7001840-906 See Attachment Below
7001840-911 See Attachment Below
7001840-912 See Attachment Below
7001840-913 See Attachment Below
7001840-915 See Attachment Below
7001840-916 See Attachment Below
7001840-917 See Attachment Below
7001840-918 See Attachment Below
7001840-922 See Attachment Below
7001840-924 See Attachment Below
7001840-926 See Attachment Below
7001840-928 See Attachment Below
7001840-931 See Attachment Below
7001840-932 See Attachment Below
7001840-934 See Attachment Below
7001840-936 See Attachment Below
7001840-937 See Attachment Below
7001840-938 See Attachment Below
Click Here to view part number descriptions for RT-300

 

7001840-901
- Radio Altimeter Transceiver

NSN: 5841-01-003-1964

Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
7001840-902
- Radio Altimeter Transceiver

NSN: 5841-01-003-1964

Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-903
- Radio Altimeter Transceiver

NSN: 5840-01-256-6113

Price Condition Status
REQUEST OH OUTRIGHT REQUEST LEAD TIME
REQUEST OH EXCHANGE REQUEST LEAD TIME
7001840-905
- Radar Altimeter Transceiver
Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-906
- Radio Altimeter Transceiver
Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-911
- Radio Altimeter Transceiver
Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-912
- Radio Altimeter Transceiver
Price Condition Status
REQUEST SV EXCHANGE REQUEST LEAD TIME
REQUEST NEW OUTRIGHT REQUEST LEAD TIME
REQUEST SV OUTRIGHT REQUEST LEAD TIME
7001840-913
- Radio Altimeter Transceiver

NSN: 5840-01-480-2290

Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-915
- Radio Altimeter Transceiver
Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-918
- Radio Altimeter Transceiver

NSN: 5841-01-483-1843

Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-922
- Radio Altimeter Transceiver

NSN: 5841-01-423-9247

Price Condition Status
REQUEST SV OUTRIGHT REQUEST LEAD TIME
REQUEST SV EXCHANGE REQUEST LEAD TIME
7001840-926
- Radio Altimeter Transceiver
Price Condition Status
REQUEST OH OUTRIGHT REQUEST LEAD TIME
7001840-928
- Radio Altimeter Transceiver
Price Condition Status
$3,500.00 SV EXCHANGE REQUEST LEAD TIME
$11,500.00 SV OUTRIGHT REQUEST LEAD TIME
7001840-932
- Radio Altimeter Transceiver

NSN: 5821-01-610-1611

Price Condition Status
REQUEST SV EXCHANGE REQUEST LEAD TIME
REQUEST SV OUTRIGHT REQUEST LEAD TIME
7001840-934
- Radio Altimeter Transceiver
Price Condition Status
REQUEST OH OUTRIGHT REQUEST LEAD TIME
REQUEST OH EXCHANGE REQUEST LEAD TIME
7001840-936
- Radio Altimeter Transceiver
Price Condition Status
REQUEST OH OUTRIGHT REQUEST LEAD TIME
7001840-937
- Radio Altimeter Transceiver
Price Condition Status
REQUEST SV EXCHANGE REQUEST LEAD TIME
REQUEST SV OUTRIGHT REQUEST LEAD TIME

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


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 Sperry/Honeywell RT-300 can be used as a replacement for the RT-220 as long as Pin E in the RT-220 mating connector is jumpered to Pin N. Of course, the mounting trays would need to be changed to compensate for the size differences between the two units.
Dirty antennas can sometimes cause poor or erratic operation of the radio altimeter system. Especially during winter months, some aircraft's nose wheel's throw dirt and slush onto the antenna. As a preventative measure to keep the antennas clean, a quality aircraft wax can be applied to the antenna.
Display lockup is a commonly encountered problem where the indicator locks up at a low indicated altitude between 5-50 feet. Some pilots will report that the radio altimeter will work normally at low altitudes but after climbing above a certain altitude the indicator locks up. Once the aircraft descends past the locked altitude, the radio altimeter works normally again.

In almost all cases, the cause of lockup is excessive signal leakage between the receive and transmit antennas. Signal leakage is commonly caused by the following situations:

- Antenna reflections hitting an object below the fuselage such as landing gear, skids, or searchlights.
- Poor ground plane between the antennas and the airframe, antennas not mounted on the same piece of metal, or antennas mounted on composite material
Sometimes a pilot may report that the radio altimeter may start indicating altitudes in the rad alt range (0-2500 ft.) at altitudes between 18000-20000 feet. This frequently occurs when flying over a reflective surface such as calm water. What occurs with second time around acquisition is that the receiver detects a return signal that was transmitted two pulses earlier not the transmitted signal it should be receiving. The time between transmitted pulses is equal to a distance in the 18000-20000 ft. range. Therefore, the receiver may process it as though it was signal it was actually trying to receive and then display the incorrect altitude.
Large needle fluctuations is a problem commonly seen when a helicopter is hovering over a soft, diffused surface such as grass. Needle jumps are usually less than 50 feet but can range from hundreds to a thousand feet. Once the helicopter moves forward, the radio altimeter should operate normally again. This needle jumping occurs because the radio altimeter is experiencing decreases in received signal strength. Over a soft, diffused surface, the signal reflection consists of hundreds of small weak reflections with different time and phase, directional qualities. These differences cause cancellations in the total return signal and cause the needle to jump.

To correct this needle jumping, some radio altimeters have an extended dB STC range. This extended range provides an additional receiver gain that can reduce the decreases in signal strength. However, the additional dB gain increase can subsequently increase the potential for display lockup caused by poor isolation between the antennas.