RNP Flashcards
How is RNP different from other Approaches
Instead of trapezoidal obstacle clearance
Use a line on either side of and parallel to published approach course - containment area
Containment area is 2x RNP value for the segment
.2 RNP = .4 NM EITHER SIDE OF AND PARALLEL TO SEGMENT CONTAINING .2 value
What is a RNP curved flight path called?
Radius to Fix (RF) legs
How are RL legs identified?
Profile view Jepp - LT Arc or RT Arc
FMC LEGS - ARC
Are 757 VNAV System compensated or UNCOMPENSATED?
Uncompensated
Is FDX 757 authorized to use VNAV above or below temp limits on RNP Charts?
No
We have uncompensated BARO-VNAV systems
Where is ANP displayed?
PFD (CTR Map)
ND
FMC POS REF (page 2/4)
Non-ILS flown in VNAV require . . . ?
5 things
- Published GP angle on the legs page for the final approach segment.
- RWxx waypoint coincident with the approach end of the runway
- MAP waypoint before the approach end of the runway. (rare)
- Two FMC
- GPS
What is “ON APPROACH” mode?
- speed window can be opened - VNAV remains in PTH
* MCP ALT can be set above the airplane’s current altitude as long as 300 ft above current altitude.
How is “ON APPROACH” mode triggered by the crew?
- VNAV in DES mode
2. Flaps out of “zero”.
How does FMC TRANSITION out of “ON APPROACH”?
- Lands
- select GA
- Fly beyond MAP point.
What does the acronym LAVS represent?
What MCP settings are required and when
What other settings (2) are required when flying AR (RNP) approaches?
Lateral (LNAV or Loc)
Altitude (TDZE Rounded up, MAP by 1000’ AGL)
VNAV selected and VNAV SPD (aircraft is high) or VNAV PTH (no later than FAF)
Speed intervention selected (flaps out of zero) and set
RNP set by IAF and MAP at 10 nm scale
When MUST you set MAP ALT on a RNAV approach?
- Stabilized on FINAL App Segment
- In VNAV PATH
- No later than 1000 AGL
- 300 ft below MAP ALT
What is the VTK tolerance at the FAF.
+/- 75 ft
When should the jet be configured for best VTK performance?
2 nm prior to FAF
What configuration is required to show VTK error?
Gear down and Flaps 25/30
Or
GND PROX switch to OVRD and gear down
What check must be made at the FAF?
Capt and FO altimeters within 100 ft
Otherwise a MAP executed
On a RNP AR during RF leg segment, what must be done if GA is required?
Discontinued Appr
Is a direct clearance to a RF leg okay?
No, prohibited
When is a GA/MAP/Disc APPR required on a AR RNP APPR?
EICAS MSGS.
•ALT DISAGREE
• UNABLE RNP
• L or R GPS
VERIFY POSITION FMC
VTK in excess of +/- 75 ft from FAF inbound
XTK greater than published segment
Do we have to go around with a VERIFY RNP scratchpad msg?
POS REF 2 of 3
No, this is normal for every RNP AR APPR.
Where can we find missed approach climb gradient information for a CFIT high area?
QRH PERF/INIT
•2.48 PW
•3.47 RR
What EICAS messages are RNP “game stoppers”?
10 messages ALT DISAGREE FMC L or R FAIL GND PROX SYS GPS/L/R INSTR SWITCH UNABLE RNP VERIFY POSITION TERR POS
Flying the APPR
Approaching FAF
• minimum RNP .13
• MAP scale 10nm
• verify VNAV PTH
• terrain display by PF no later than IAP
PASSING FAF
• monitor. VTK and XTK RNP scales (75 feet)
- requires • Gear down • flaps 25 or 30• GND PROX - OVRD
• monitor digital readouts
• verify altimeters are within 100 ft or Go Around
5 most common VNAV MISTAKES
- Setting MCP PREMATURELY
- DELAYED MCP ALT CHANGE RESULTING IN VNAV ALT FMA
- Selecting ALT Intervention and deleting alt constraint next waypoint
- ensure speed window after selection of VNAV during LAVS
- Not ensuring RNP value is small font for all approaches other than RNP AR
- not being stabile at FAP Fix
