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Part 4 Navigation > CH4 Extended Diversion Time Operations > Flashcards

CH4 Extended Diversion Time Operations Flashcards

1
Q

What is the default threshold time for a twin engine aircraft vs a 3/4 engine aircraft?

A

Twin: 60 minutes

3/4: 180 minutes

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2
Q

What are the conditions used to determine the threshold distance?

A

OEI cruise speed
Still Air
ISA conditions

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3
Q

What rule part in NZ covers EDTO operations?

A

CAR 121

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4
Q

What is does CMP stand for? What is is?

A

Configuration, maintenance and procedures

Regulatory document that must be complied with for EDTO operations. it is produced by the manufacturer

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5
Q

What type of power plants must be used in an EDTO operation?

A

Turbine engines

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6
Q

What is the definition of an adequate aerodrome?

A
  • Adequate length and strength
  • An Instrument approach
  • Approach and Runway lighting (incl PAPI/VASI)
  • Rescue fire service of level 4 or equivalent
  • ATC or AFIS
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7
Q

What is a suitable aerodrome?

A

An adequate aerodrome at which the weather is forecast to meet minimum requirements

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8
Q

What is the chance of an EDTO incident/accident?

A

“Extremely Remote”

less than 10^-8

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9
Q

What is the basic EDTO philosophy?

A
  • To preclude a diversion being required, and

- To have programs in place protect the diversion if it were to be required

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10
Q

What things have been included in the preclude aspect of EDTO philosophy?

A
  • Design enhancements to enhance reliability
  • Systems designed/tested to ensure acceptable level of IFSD
  • Maintenance and despatch requirements
  • Engine condition and oil consumption monitoring
  • Human error reduction in maintenance
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11
Q

What is a critical system?

A

One that in the event of a failure the QRH reads land at the nearest suitable airfield

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12
Q

What things have been included in the protect aspect of the EDTO philosophy?

A
  • Pilots are knowledgable about about diversion alternate aerodromes
  • Pilots have the ability to communicate with operator flight watch and ATC
  • Aircraft has sufficient fuel and system redundancy
  • Diversion airfield has facilities to protect pax from the elements
  • Diversion airfield is suitable and will allow an approach to be commenced
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13
Q

What things does the CAA consider before granting EDTO approval?

A
  • Type design (airframe/engine combo)
  • Operator’s inservice experience
  • Propulsion system reliability records
  • Continuing surveillance of propulsion and airframe system reliability
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14
Q

What two certificates are required for EDTO certification?

A
  • EDTO Type design approval

- EDTO Operation Certification

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15
Q

When EDTO is granted for more than 180 minutes EDTO what factors should be considered in the range circle plots?

A
  • Actual/forecast winds
  • Actual/forecast temperatures
  • Limiting systems (usually cargo fire suppression system)
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16
Q

What is the FAA definition of in flight shutdown?

A

for EDTO only, “When an engine ceases to function (when the aircraft is airborne) and is shutdown, weather self induced, flight crew initiated or caused by an external influence”

17
Q

What things does the definition on an IFSD exclude?

A
  • when followed immediately by an automatic relight

- engine doesn’t produce the desired thrust but is not shutdown

18
Q

What flights are included in IFSD data?

A

Every flight after the delivery of the aircraft

19
Q

What is the max IFSD rate for 120, 180, 180+ EDTO?

A

120: Less than 5/100,000 engine hrs
180: less than 2/100,000 engine hrs
180+: less than 1/100,000 engine hrs

20
Q

What period is the IFSD rate data gathered?

A

12 month rolling average

21
Q

What is Air NZ’s policy when planning an EDTO operation?

A

To consider 3 stages:

  • From departure to entering first EDTO
  • From first EDTO entry until last EDTO exit
  • From EDTO exit until destination
22
Q

What fuel is required for an EDTO flight?

A
  • Normal flight fuel (A-B, contingency, reserves)
  • Emergency reserves (enough to divert from most fuel critical ETP in the EDTO segment to a suitable alternate and hold overhead for 15 minutes, and then conduct an instrument approach)
23
Q

Describe how it is possible to see ETP diversion times that exceed the EDTO certification?

A

EDTO is not based on the same depressurised scenarios as ETPs are

24
Q

What things should be done by flight crew prior to entering EDTO phases of flight? What should be done if they are inoperative?

A
  • Serviceability for EDTO significant systems

- If U/S QRH, MEL and Flight operations should be referenced

25
Q

What must the weather at the EDTO alternates be once the aircraft is airborne and in the EDTO region?

A

At or above the landing minima

26
Q

What met minima must be met at EDTO alternates?
2+ precision Approaches
1 Precision approach
Non precision approach

A

2+ PA: 400ft or +200ft (above minima) ceiling, 1500m or +800m vis

1 PA: 600ft or +400ft ceiling, 3000m or +1500m vis

NPA: 800ft or +400ft ceiling, 4000m or +1500m vis

27
Q

What different case considerations must be made when determining EDTO > 180min boundary ranges?

A
  • Case 1: AEO

- Case 2: OEI

28
Q

What are the conditions for calculating the Case 1 EDTO >180 min diversion?

A 
Normal cruise speed
Cruise Altitude
Corrected for wind and temp
Cargo fire suppression time limit - 15 minutes
Shown as bold (red) line
29
Q

What are the conditions for calculating the Case 2 EDTO >180 min diversion?

A 
LRC (or stated higher)
Drift-down altitude
Corrected for wind and temp
Most time limiting system - 15 minutes (excl cargo fire)
Shown and thin continuous line
30
Q

What is ‘Company Speed”? What is it used for? What is the value?

A

A higher OEI cruise speed to extend the Case 2 limiting distance
Entered into the FMC as CO Speed and is equal to 315kts IAS

31
Q

What disadvantages will be meet due to using CO SPEED for the Case 2 cruise speed?

A

Increases ETP build up fuel
Fuel burn penalty due to increased weight
May affect payload capacity

32
Q

What additional equipment are required for EDTO > 180 minutes than aren’t for less than 180 min?

A

APU

SATCOM voice

33
Q

In what circumstance may an aircraft fly outside the flight planned area of operation on an EDTO segment?

A

If it is only slightly outside due to a weather diversion

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