Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter.

These tests were conducted to establish a moderate icing flight envelope for the helicopter with the AN/ALQ-151(V)2 countermeasures system installed. A total of 12.3 hours were flown in the icing environment. After damage to an unprotected direction finding (DF) dipole antenna during an icing encoun...

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Bibliographic Details
Main Authors: Tavares,E J, Sullivan,P J, Hanks,M L, Woratschek,R
Other Authors: ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA
Format: Text
Language:English
Published: 1984
Subjects:
Helicopters
Flight Control and Instrumentation
Snow
Ice and Permafrost
*FLIGHT TESTING
*ICE FORMATION
*HELICOPTERS
ENVIRONMENTS
MILITARY AIRCRAFT
DAMAGE
ELECTRONIC EQUIPMENT
RATES
DIRECTION FINDING
ICE
ELECTROMAGNETIC INTERFERENCE
OPERATION
PROTECTION
FLIGHT ENVELOPE
HEAT
ACCUMULATION
AVIATION SAFETY
ELECTRONIC COUNTERMEASURES
OSCILLATION
INDICATORS
DIPOLE ANTENNAS
ROTOR BLADES
AIRCRAFT CABINS
*YEH-60A aircraft
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA155147
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA155147
Description
Summary:These tests were conducted to establish a moderate icing flight envelope for the helicopter with the AN/ALQ-151(V)2 countermeasures system installed. A total of 12.3 hours were flown in the icing environment. After damage to an unprotected direction finding (DF) dipole antenna during an icing encounter, the original DF dipole antennas were removed and a prototype thermoelectrically anti-iced DF dipole antenna was installed in position no. 3 (aft right side). During these tests 4 deficiencies and 16 shortcomings were noted. The two icing related deficiencies are: damage to the DF antenna element mounts and phenolic blocks caused by excessive element oscillations induced by ice accumulation; and erroneous readings on the Rosemount Icing Rate Indicator caused by electromagnetic interference from the electronic countermeasures system which prevents simultaneous safe operation of the ECM system and the blade deicing system. The two non-icing related deficiencies are: interference between the main rotor blades and the upper elements of the aft DF dipole antennas during rearward ground taxi and the inadequate cabin heat. The YEH-60A Quick Fix helicopter as originally configured (unheated DF antennas) was not suitable for flight in a moderate icing environment.

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