C17 IAC - Time Control_MC Prep.txt

Current GS and conditions to the next waypoint. Adds VPF ETE thereafter (1-664)(-2)

• 1. Configuration Limit (never command >VMAX -10 or < VMMA)
• 2. “SPEED LIMIT” on a performance page (250/10000)
• 3. “MAX SPD” on the SPD CSTR AT WAYPOINT (Climb/Descent Only)
• 4. “AT SPD” (prior to waypoint) [FPLAN only]
• 5. F-PLAN Calculated Speeds to make time constraints [FPLAN only]
• 6. “SPD” (after waypoint) on Waypoints Page[FPLAN only]
• 7. Tech Order Speed

• Current Data* (Atmospheric Model) =>200 nm or 4000 feet
• Spot Winds (Define Review Waypoint Page)
• Climb/Descent Winds
• Wind Factors on RTE Data Page
• Calm

*Current Data: MC uses ADC/IRS data for temp, temp dev, PA, hdg, drift, GS, and wind.

• AT Altitude (At Before)
• AT/ABOVE, AT/BELOW
• CRZ FL (At After)
• CRZ Alt on RTE Data Page

• - Timing Triangles
• - Orbit points (<10K, 360=2.4 min / >10k, 1% TAS = # mins for 360)
• - 10% rule: Inc/dec IAS by 10% for 10 min to gain/lose 1 min
• - Incremental Method: IAS/6=x. Inc/dec IAS by x for 1 min to gain/lose 10 sec.
• - Proportional Method: Inc/dec IAS by # sec early/late. Hold for #secs = to original IAS.
• - Change TOT
• - 10 knot ROT: will lose/gain 1 sec/NM traveled for each 10 knots of GS faster/slower than planned GS

FPLAN: Cruise phase only. Uses user-entered airspeeds or calculates speeds based on time constraints

TECH: Used when engine out performance is confirmed. Provides ETE/ETA, bur no time control. Used for Direct To/Intercept Legs and as default when FPLAN speeds are selected, but none are manually entered and no time constraints exist.

MAN: Manually entered. Provides ETE/ETA, but no time control.

 

When there is no intervening hard waypoint