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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ftdtic:ADA155147 2023-05-15T16:37:32+02:00 Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. Tavares,E J Sullivan,P J Hanks,M L Woratschek,R ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA 1984-06 text/html http://www.dtic.mil/docs/citations/ADA155147 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA155147 en eng http://www.dtic.mil/docs/citations/ADA155147 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS 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 Text 1984 ftdtic 2016-02-21T00:27:18Z 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. Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
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English |
topic |
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 |
spellingShingle |
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 Tavares,E J Sullivan,P J Hanks,M L Woratschek,R Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. |
topic_facet |
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 |
description |
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. |
author2 |
ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA |
format |
Text |
author |
Tavares,E J Sullivan,P J Hanks,M L Woratschek,R |
author_facet |
Tavares,E J Sullivan,P J Hanks,M L Woratschek,R |
author_sort |
Tavares,E J |
title |
Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. |
title_short |
Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. |
title_full |
Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. |
title_fullStr |
Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. |
title_full_unstemmed |
Artificial and Natural Icing Tests YEH-60A Quick Fix Helicopter. |
title_sort |
artificial and natural icing tests yeh-60a quick fix helicopter. |
publishDate |
1984 |
url |
http://www.dtic.mil/docs/citations/ADA155147 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA155147 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA155147 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027828580581376 |