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MH-60R BONUS deck > De-Ice > Flashcards

De-Ice Flashcards

1
Q

DE-ICE MASTER on automatically

A

Turns on

ENG ANTI-ICE, WINDSHIELD ANTI-ICE, and BLADE DE-ICE POWER (even if their physical respective switch is off)

when ice accumulation is sensed by the ice detector

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2
Q

ICE DETECTED

A

Caution illuminates when ice detector senses ice

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3
Q

DE-ICE MASTER - off

A

Disables automatic function

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4
Q

DE-ICE MASTER on with

A

ENG ANTI-ICE, WINDSHIELD ANTI-ICE, or BLADE DEICE POWER switches in the on position will also disable automatic function (as appropriate system will operate continuously…because it is on)

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5
Q

The rotor blade deice system consists of:

A
  1. System control panel
  2. Test panel
  3. System controller
  4. Power distributor
  5. Main and tail slip rings
  6. Main and tail blade heating elements
  7. Caution lights
  8. OAT sensor
  9. Modified ambient sense line
  10. Ice detectoe/signal converter subsystem
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6
Q

The blade deice system provides

A

Controlled electrical power to integral heating elements in the main and tail rotor blades, causing the ice bond layer to weaken, allowing symmetrical ice shedding

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7
Q

Can the system be ground-checked?

A

Yes, the blade deice system may be ground-checkednwith the use of external power. Ac power is supplied through thr blade deice distributor.

The EOT (Element-on-time) feature can NOT be checked on the ground.

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8
Q

BLADE DEICE control panel warning

A

Leaving the BLADE DEICE POWER switch in the test position can lead to blade damage

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9
Q

The ice detector is

A

Mounted on the No. 2 engine cowling, senses ice accumulation on a vibrating probe by measuring the change in probe frequency.

When the ice detector senses ice accumulation, the ICE DETECTED caution will be illuminated. Simultaneously, an aspirator heater on the probe is turned on to heat the probe, shed the accumulated ice, and reset it for another cycle.

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10
Q

Severity of the icing is

A

Proportional to the rate at which the probe heater is cycled

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11
Q

What governs the EOT heating?

A

OAT sensor below the windshield

Lower OAT = longer EOT

With mode selected AUTO, the controller processes the ice-rate signal to produce heating element off-time and the OAT signal yo produce the heater EOT.

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12
Q

Controller sends command signals through

A

The main rotor slipping to the blade deice distributor

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13
Q

How are the blades deiced?

A

In cycles to reduce power requirements

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14
Q

What does the system distributor do?

A

Switches power in sequence to the main rotor blade heater zones

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15
Q

Why isn’t there a tail rotor blade distributor?

A

Because power is applied to the four tail blades simultaneously

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16
Q

What do droop-stop heaters do?

A

Supply heat to the droop-stop pins and cams during icing conditions

The droop stops are continuously heated as long as the BLADE DEICE power is in ON or TEST

17
Q

As a pilot you can control what via the rotary switch?

A

Fixed off time of the blade heaters.

Via in MANUAL mode: T, L, and M
Selected one of these maula modes if there is a ICE DETECT FAIL caution

18
Q

When should you use MANUAL mode (apart from ICE DETECT FAIL):

A
  1. Pilot has determined by judgement of icing intensity that the ice rate system is inaccurate
  2. Torque required has increased to an unacceptable level
  3. Helicopter vibratiojnhas increased to an unacceptable level
19
Q

BLADE DE-ICE TEST

A

BIT

Tests caution lights and circuitry

Two amber PWR lights on panel warn of power malfs of main or t/r deice system

20
Q

What does the BLADE DEICE TEST do?

A

Allows deice system to test for failures that are otherwise doemand during normal test mode

through introducing selected failure signals into the system and then requiring BIT circuitry to function in a specific manner

21
Q

Windshield Anti-Ice system is used to

A

Prevent ice and fog from forming on windshields

22
Q

What is the windshield anti-ice slcomprised of

A

Pilot and co-pilot windshields are electrically heated safety glass with heating elements and built-in temperature sensors

Both windshields have their own separate anti-ice system

23
Q

Pilot or co-pilot WINDSHIELD ANTI-ICE - on does what?

A

Sends power to the windshield heating elements

24
Q

Windshield anti-ice system warning:

A

A faulty windshields anti-ice system could result in arcing and delamination of the windshield

If not secured in a timely manner, an electrical fire could result

25
Q

Pitot-static tube heaters are located

A

In the pitot tube and static ports to keep ice from forming on the tube and ports and help keep moisture out

26
Q

Pitot heaters are controlled by

A

PITOT HEAT switch

27
Q

RIGHT PITOT HEAT

LEFT PITOT HEAT

A

cautions indicate a low or not-heat condition when the switch is ON

28
Q

Pitot heat warning

A

Shall be turned on when visible moisture is present and/or the OAT is 5°C or below

Failure to turn on pitot heat on icing conditions may cause erroneous airspeed indications, which can lead to erratic and/or downward programming of thr stabilator and loss of control of the aircraft

NOTE: don’t use to warm flight equipment

29
Q

BLADE DEICE TEST panel:

  1. Norm
  2. Sync 1
  3. Sync 2
  4. OAT
  5. EOT
A
  1. Norm = provides signal path for normal ops
  2. Sync 1 = signal path to the controller
  3. Sync 2 = open circuit to the controller
  4. OAT = short circuits OAT to check BIT, sense fault when power - test
  5. EOT = disables OAT sensor BIT circuits to simulate defect in EOT timing circuit (on + mode m)
30
Q

System controller power route

  1. Main rotor
  2. T/r
A
  1. Sends comand signals ➡️ m/r sliprings ➡️ distributor ➡️ m/r heater zones (heated in cycles to reduce power reqs)
  2. Skips distributor and sends command signals ➡️ t/r sliprings ➡️ t/r blades (all 4 t/r blades heated simulatenously)

MH-60R BONUS deck (26 decks)

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