VNAV

[Benjozork]

Aircraft Version

Experimental

Description

• [ ] Theoretical Approach Profile / DECEL path
  • [x] faf to 1000ft @ Vapp ^1
  • [ ] Not always true... ex.: early stabilized approach (Vapp @ fdp)
  • [ ] Deceleration from DES speed to Vapp
  • [x] First version with fixed fpa (-3deg) when possible
    • [x] Constant slope segments ^2
    • [x] Naive linear computation
    • [x] Computation of deceleration in config changes
    • [x] Iterative solve to achieve minimal final altitude error at end of segment
  • [ ] CDA vs. Non-CDA modes
  • [ ] Take into account fpa/alt/spd constraints
    • [ ] Define what "fpa constraints" are
    • [ ] Constant speed segments ^2
  • [ ] Theoretical Descent Profile
  • [x] Naive (rule of three) estimate to ToD
  • [ ] Geometric path behind TAP / DECEL path
  • [ ] Idle path
    • [ ] Solve ToD iteratively to achieve minimal error to DECEL point
  • [ ] Repres. segment
  • [ ] Climb profile
  • TBD
  • [ ] Emit pseudo-waypoints (ToD, DECEL) to MCDU and EFIS
  • [x] PwpCdaFfap1White
  • [x] PwpCdaFfap2White
  • [x] TopOfDescent
  • [ ] MCDU display
    • [x] Insertion
    • [ ] Statistics
  • [x] EFIS display

Discord Username (optional)

someperson#4953

[2hwk]

Pre-empting the noise that will be created as a result of this issue, this will be locked for contributors only so that we can use this for its intended purpose of tracking.

[Benjozork]

Looks like I'll need to revert to level deceleration segments / targeted deceleration segments in the case where the available gradient is less than -3deg for the first version.

Working on the reversion logic right now. DECEL plotting somewhat realistically with the test values.

[Benjozork]

[Benjozork]

Ok calculating flap 1 and 2 CDA pseudo wpts right now (in-non CDA mode, but this is useful for debugging), and they are too far out at some elevated airfields.

It looks like with higher T/D ratios we are reaching low deceleration rates (observed: -0.11kn/s) causing very long config change CONSTANT_SLOPE segments.

Either

• something is wrong with the T/D
• I really need to add iterative step prediction
• I need to revert to LEVEL_DECELERATION or CONSTANT_DECELERATION below a certain deceleration rate

[Benjozork]

• I really need to add iterative step prediction
• I need to revert to LEVEL_DECELERATION or CONSTANT_DECELERATION below a certain deceleration rate

Done