Timing Control

Question 1

How is delta T computed?

Answer 1

current ground speed to the next waypoint, then MC thereafter

Question 2

Using the PRFM pages, what does TECH, MAN, or FLPN do?

Answer 2

*TECH directs MC to use four engine technical order speeds
MAN allows the selection of a speed from 0-350 knots as define by the crew
*F-PLN tells the MC to use speeds defined in the FLPN pages or default to TECH if not defined

Question 3

When is the 1 minute/10,000’ technique accurate?

Answer 3

when there are no waypoints between top and bottom of climb/descent

Question 4

Describe the speed hierarchy

Answer 4

the aircraft won’t exceed Vmax-10 or

Question 5

What is the speed hierarchy?

Answer 5

SPEED LIMIT (PRFM page)

	MAX SPD in climb/descent (WAYPOINT page)

	AT SPD (WAYPOINT page) 

	F-PLN calculated speed to make constraint

	SPD (WAYPOINT page

Question 6

performance page selections and meanings

Answer 6

Technical Order Speed Selection (TECH)
-Directs the MC to use the 4-Engine tech order speeds for the phase of flight

Manual Speed Entry/Selection (MAN)
-Directs the MC to use the speeds manually entered for the phase of flight

Flight Plan Speed Selection

• Directs the MC to use the speeds in the flight plan
• This is the function that forces the MC to calculate new speeds to meet constraints

Speed Limit

• Generates a soft waypoint establishing a max speed below a specified altitude
• This speed may need to be cleared for low level/high speed calculations

Question 7

When is delta T displayed on MFD?

Answer 7

only when NAV is selected

Question 8

What is a TECH order climb/descent?

Answer 8

250 till 10,000 then 310/.74

Question 9

What is an AT ALT?

Answer 9

Requires the aircraft to be at the altitude PRIOR to the waypoint

Question 10

What is an AT SPEED?

Answer 10

MC adjusts the speed to the AT SPD prior to the waypoint

Question 11

What is a SPEED?

Answer 11

MC adjusts to this SPD after sequencing the waypoint

Question 12

What is the altitude hierarchy?

Answer 12

AT ALT, AT/ABOVE, AT/BELOW
CRZ FL
CRZ ALT (On Route Data Page)
Nominal Calculation (i.e. nothing in Route Data)

Question 13

How does the atmospheric model work?

Answer 13

MC uses ADC and IRS data for temp, temp dev, pressure alt, heading, drift, ground speed, and wind. Model assumes current conditions to 200NM and +/- 4000’.
Model updated every 5 minutes.

Question 14

vertical flight plan takeoff segment

Answer 14

Starts at field, ends at 1500’, 3 minutes, 8NM from liftoff

Question 15

vertical flight plan flight plan segment

Answer 15

Includes climb, cruise, descent (begins at the end of Takeoff, airdrop, or rendezvous segments and ends at the FAF, ARIP or ADIP

Question 16

vertical flight plan rendezvous segment

Answer 16

Begins at ARIP and ends at ENDAR (time control terminated)

Question 17

time control musts (ADFVOR)

Answer 17

Accelerate/decelerate at the LL/combat entry point
Delete the cruise SPEED LIMIT if necessary
Fix your next time constraint
Verify speeds throughout flight plan—do they make sense?
Obstacle clearance—set 6000’ VVI to ESA if necessary
Route Data—reset CRZ ALT if necessary

Question 18

How can time be gained or lost?

Answer 18

orbit-build a holding pattern
10% rule
incremental method
mach method
proportional method
timing triangles
10 knot rule
parallelogram

Question 19

Describe the wind hierarchy-

Answer 19

MC uses ADC and IRS data updated every 5 min for atmospheric data and then assumes those conditions for the next 200 miles within 4000’ of the aircraft’s altitude

Question 20

If on the ground, sensor data invalid, or for flight outside of that envelope the MC will use the following in order:

Answer 20

spot winds (define/review WP)
CLMB and DESCENT WINDS (WINDS page)
WF1/WF2 (RTE DATA)
Assumes zero