Billings CH47D > 47D Gotchas > Flashcards

47D Gotchas Flashcards

(56 cards)

Study These Flashcards
1
Q

Engine Horsepower

A

10 Min Limit… 4,867 hp
2.5 Min Limit… 5,069 hp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Rotor Tach Markings

A

91… minimum transient (red line)
97-101… green arc
102-105… transient (yellow arc)
106… max transient power ON (red line)
108… max during autorotation (red line)
111… max transient (red line)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Flight Hydraulic Pressure Markings

A

2500psi… lower red line
2500-3200psi… green arc
3200psi… upper red line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Utility Hydraulic Pressure Markings

A

2500psi… lower red line
2500-3500psi… green arc
3500psi… upper red line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Utility and Flight Control Hydraulic Temp Markings

A

95-120C… yellow arc
120C… red line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

PTIT Limits (Tha Realist)

A

MCP… 816
30 Min Max… 854
10 Min Max… 899
2.5 Cont… 932
12 Sec Cont… 943

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

N1 Limits (Tha Realist)

A

Ground Idle Min… 50%
Max… 111%

N1 over 111% is an engine overspeed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Emergency Fuel (100LL)

A

Emergency fuel shall not be used for more than 6 hours cumulative time.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Use of Shall, Should, and May

A

Shall… mandatory requirement
Should… nonmandatory but preferred method of accomplishment
May… an acceptable method of accomplishment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Flight Controls out of Neutral

A

It is possible for the ground to forward rotor blade clearance to be 4 feet 4 inches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Blade Chord

A

32 inches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

“Warning”

A

An operating procedure, practice, etc. which if NOT correctly followed, could result in personal injury or loss of life

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

“Caution”

A

An operating procedure, practice, etc. which, if not strictly observed, could result in damage to or destruction of equipment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

“Note”

A

An operating procedure, condition, etc. which is essential to highlight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Aerobatics Defined (also, prohibited)

A

Intentional maneuvers beyond 30* Pitch and/or 60* Roll

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Bank Angle Limits

A

With working CGI, they are limited by CGI but not to exceed 60* bank.

When using altitude hold, limit bank angle limits to 45* max.

With inop CGI, use bank angle limits defined in Fig 2-5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Bleed Band Actuator

A

Primary mode… HMU uses P3 pressure to control bleed band actuator, causing the band to snap open and closed

Reversionary mode… HMU uses fuel pressure as controlling medium, causing the band to modulate (slowly open or close)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Fig 3-4 SE Service Ceiling Contingency Power “Note”

A

Chart based on aircraft flying Vy to provide a max of 100fpm climb for given pressure altitude and temp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Fuel/Oil/Hydraulic Filter LRBs

A

All filters can be bypassed except for the 3 hydraulics Pressure filters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Dual Engine Fires

A

Fight one fire at a time. If both Fire Pull Handles are out and agent is discharged, it will be sent to both engines at an unknown ratio (not 50/50)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Engine Transmissions

A

The engine transmissions are interchangeable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

XMSN OIL PRESS light with normal pressure indications

A

The aft shaft doesn’t have a pressure transducer but does have a pressure switch that illuminates the XMSN OIL PRESS light at 10psi or less. This could cause the XMSN OIL PRESS light to illuminate whole the gauge shows normal pressure ranges

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Batt Switch on, only source of electrical power

Study These Flashcards
A

With the batt switch on, the essential, switched battery, and hot battery busses are energized. Regardless of switch position, the switched battery and hot battery busses are powered directly by the battery.

24
Q

Pitot Heat Switch

Study These Flashcards
A

When placed ON, it provides power for the pitot tubes AND yaw ports

25
Rotor Blades
Chord is 32 inches, outer 54 inches leading edge covered with nickel for erosion protection
26
EPUSHA Operations
Multiple EPUSHA operations can deplete the battery to the point where APU can't be started. The number of EPUSHA operations should not exceed five.
27
Jet Pumps (Fuel System)
Are used to evacuate fuel within the refueling manifold back into the main tank. The jet pump is activated when the forward boost pump in each main tank is first turned ON after pressure refuel
28
ENG FAIL Parameters
Power turbine shaft failure = N2>Nr by more than 3% N1 underspeed = N1 below 48% Engine flameout Overtemp start abort (PRI only) FADEC PRI and REV failure
29
Lights on with Gen Fail and no cross tie
GEN OFF FUEL PRESS RECT AFCS
30
Forward and Aft Stationary Rings Composition
Forward is aluminum Aft is steel
31
LCT Conditioner/Processor
Conditioner in fwd pylon, receives signal from fwd fixed link and sends it to processor Processor in Aft pylon, takes the larger of the 2 signals (fwd and aft) and sends it to the CGI in cockpit
32
Utility and Flight Control Hydraulics Interchangeability
The temp sensor, thermal switch, and relief valve are interchangeable between the 1, 2, and utility hydraulic reservoir coolers
33
Utility Hand Pump Emergency Use
Hand pump can be used in an emergency to provide pressure to aircraft utility subsystems as long as the Emergency Utility Pressurization Valve is open (located to right of hand pump)
34
Generator 2 Second Delay
Delay turning the second generator on for 2 seconds. This Delay will give DECU time to sample power without causing a soft fault.
35
Centering Device Release Switch (cyclic)
When pressed: 1. Mag brakes in pitch roll and yaw are released 2. Heading hold and bank angle hold are MOMENTARILY released 3. HDG select is DISENGAGED
36
AFCS Built In Test Equipment (BITE)
For ground troubleshooting only. ECLs must be in the STOP position for the BITE to function
37
Quantity of LRBs
37 total 16 in front 21 in back (16 to drive, 21 to drink)
38
NR% Selector
Rotary switch which provides different rrpm control Only works in primary mode 100% has detent Can select 97%-103% ECLs must be in fly
39
Cbox Aux Oil Flow
Reservoir Pump Relief valve on no. 2 side of xmsn Pushed through aux filter on front of xmsn Gears and bearings Scavenged through no. 2 side debris screen on bottom of cbox Reservoir
40
Cbox Main Oil Flow
Reservoir No. 1 pump Filter on top of xmsn Cooler Filtered by inlet screen on no. 1 side of xmsn Gears and bearings Scavenged through no. 1 debris screen on bottom of cbox Reservoir
41
Engine XMSN OIL Flow
Reservoir Pump Filter on back of cbox Cooler Jet protection screen on back wall behind xmsn Gears and bearings Scavenge pump sucks it back through debris screen on cbox Reservoir
42
Fwd XMSN Main Oil Flow
Reservoir Tube connected to pump screen Main Oil filter Cooler Inlet screen on no.1 side of xmsn Passes pressure transducer line Passes Main Oil Pressure switch no.1 side of xmsn Gears and bearings Reservoir via gravity
43
Fwd XMSN Aux Oil Flow
Reservoir Pump pulls oil through debris screen Aux Oil filter Aux pressure switch Gears and bearings Reservoir, via gravity
44
Aft XMSN Main Oil Flow
Reservoir Tube connected to pump screen Main Oil filter Cooler Inlet screen filter on no.1 side xmsn Passes Main Oil Pressure switch no.1 side xmsn Passes Pressure transducer line Sent to generators and Scavenged by Main Oil pump Sent to Gears and bearings Sent to aft vert shaft Thrust bearing Reservoir, via gravity
45
Aft XMSN Aux Oil Flow
Reservoir Pulled through debris screen by aux pump Aux Oil filter Passes aux pressure switch Gears and bearings Reservoir, via gravity
46
APU vs. Generators Wires (6 vs. 4)
Both generators are 3 phase, each phase on apu gen has its own ground, while all 3 phases on main generator share a common ground
47
Why 3 Phase Generators?
Each phase is capable of producing peak voltage of 115vac. With the generator phase output being cyclical, set 120* apart from each other, it allows the electrical components to receive a continuous and smooth 115vac at all times
48
What does 400 Hz mean?
It means the generators complete 400 cycles per second, with one cycle starting at 0vac, peaking at 115vac, dropping 0vac, continuing down to 115vac, and then rising back up to 0vac, completing the cycle. This allows our gyros and fuel pumps to be smaller since they too will be spinning at 400 cycles per second
49
How much KVA is required to power the entire electrical system, everything turned on, with as much of an electrical demand on the system as possible?
15Kva
50
What is the max Hz the generators can produce?
420Hz. The generators are incapable of producing a high enough frequency that could cause harm to the systems components. Therefore, the GCU only monitors for under-frequency, as well as over-voltage and under-voltage.
51
Why is Min Rotor Transient 91%?
The GCU will shutoff the generator if rotor rpm decays to 82-85% for more than 3-7 seconds due to under-frequency conditions. 91% is the rrpm that the GCU will bring the generators back online.
52
Black Donuts with APU Gen Feeder Lines Going Through Them
Those are the negative current transformers for the apu gen. They are used in conjunction with the apu gen positive current transformer (located in No. 2 PDP) to allow the apu gcu to detect a feeder fault
53
What does the Battery power when it is plugged in, batt switch off?
Hot Battery Bus: •hydraulic level indication •APU emergency control Switched Battery Bus: •mag brakes (all axis) •ramp and cabin lighting •emergency exit lights •refuel station •forward XMSN oil level light
54
Why is it called the Switched battery bus?
It is powered regardless of battery switch position. Instead, it gets its name because it switches over to being powered by the T/Rs once AC power is available.
55
Dual purpose of reverse current cutout relay?
1. Prevent reverse current from going to the T/Rs 2. Illuminate the RECT 1/2 lights if there isn’t current flowing through them. When there is normal flow of current going through them they will extinguish the RECT 1/2 light
56
Fixed and Centrifugal Droop Stops
Forward Fixed: limit flap to 4.5* to 5* Aft Fixed: limit flap to 5.5* to 6* Aft Centrifugal Droop Stops: limit flap to 1.25* to 1.75* •Disengaged at 67% RRPM •Engaged at 56% RRPM
Billings CH47D
flashcards
Decks in class (8)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions