FMS App & Malfunctions

Question 1

Manual Intercept of RNAV Approach Procedure

Answer 1

Use CMD HDG to Intercept Final Apporach Course

Use VS or ALT to intercept Glidepath

• When within 50nm of Aerodrome:
  
  • PF: “Activate Approach”
    
    • PM: “Approach Active, LNAV, ____“
• When within 90° of final approach track
  
  • PF: “Arm Intercept”
    
    • PM: “Intercept Armed
• ​At Final approach intercept, check RNAV HDG extinguished:
  
  • .
    
    • ​​PM: “Approach Captured”
  • ​​PF: “Checked”
  • PF: Select VNAV Swithchlight
  • PF: “ VNAV Armed”
    
    • ​PM: “Checked”
• ​​At Vpath Capture, verify VNAV Annunciation:
  
  • ​.
    
    • ​PM: “VNAV Captured”
  • ​PF: “Checked”

Question 2

RNAV Approach Limits

Answer 2

Maximum Lateral Error (Track):

• MAP Mode: XTE .15nm (1/2 of Fullscale .3nm inside FF)
• FULL/ARC Mode: Half Scale

Maximum Vertical Error (Glidepath)

• Half scale above & below

Question 3

What does the GPS INTEG annunciation mean?

Answer 3

It Means 1 of 2 things:

• The GPS receiver is receiving signals from less than 5 satelites (RAIM unavailable)
  
  • GPS not NAV - Availablity
• The GPS signals sent to the receiver contain errors that cause the GPS certainty of position to be 2 large (Horizonatal Integrity Limits - HIL)
  
  • Satelite POS Alarm - Accuracy

Question 4

How many Satelites are required for RAIM?

Answer 4

• 5 Satelites
  
  • 4 satelites to agree on a position; and
  • the 5th Monitors the integrity by agreeing with the 4

Question 5

When must RAIM be checked?

Answer 5

• The availability of RAIM at our destination must be checked prior to departure by either:
  
  • NOTAM; or
  • IFIS

Question 6

How long is a RAIM forcast valid for?

Answer 6

• 72 hours (3 days)