CAT I/II/III Minimas and Low Visibility Flashcards
Minimum DH for CAT I Approaches
200ft Baro
Minimum RVR/Visibility for CAT I Approaches
550m RVR/800m Visibility
Minimum DH for CAT II Approaches
Lower than 200ft RA but higher than 100ft RA
Minimum RVR for CAT II Approaches
300m
Minimum DH for CAT III Single (Fail Passive) Approaches
50ft RA
Minimum RVR for CAT III Single (Fail Passive) Approaches
200m
Minimum DH for CAT III Dual (Fail Operational) Approaches
25ft RA
Minimum RVR for CAT III Dual (Fail Operational) Approaches
100m
What is the Controlling RVR?
For landing, the controlling RVR is the TDZ, however if this value is not reported, the MID point value is considered the controlling RVR
Minimum RVR for Take-off
150m which should be achieved in all the relevant points (TDZ/MID/END)
Recommended power and flaps settings for an LVTO
FLEX and Flaps 2 are recommended for T/O
Colour of the runway center lights
•White center lights from threshold to 900m to the end of the runway
•Alternating red/white center lights from 900m to 300m to the end of the runway
•Red center lights for the last 300m
Minimum height to disconnect AP in CAT II Approaches (No Autoland)
80ft AGL
Minimum Height to disconnect AP in CAT I Approaches
160ft AGL
The alert height is…
Height above the runway above which a CAT III approach is discontinued, and a missed approach initiated if a failure occurs in one of the redundant parts of the autoland system or in the relevant ground equipment, if a failure occurs below, FMGC freezes the landing capability
ILS CAT III Alert Height
100ft AGL
CAT II and CAT III fail passive autoland should be performed with flaps…
3 or Full depending on MSN
Maximum Glide Slope Angle to perform CAT II and CAT III autoland
Between -2.5° and -3.25°
Maximum Airport Elevation to perform an autoland
Depends on MSN but normally between 2500ft/9200ft
Minimum Aerodrome elevation to perform an Autoland
From -1000ft to -2000ft depending on MSN
CAT II/CAT III Land light appears at…
350ft AGL
Below 200ft Autoland Warning is triggered if…
• Both AP’s trip off
• Excessive Beam deviation
• LOC/GS transmitter or receiver fail
• RA discrepancy of at least 15ft
Flare appears on FMA at…
40ft AGL
THR IDLE appears on FMA at…
30ft AGL
Discontinue a CAT II/III Approach below 1000ft AGL when
• Alpha Floor
• AP OFF
• Amber Caution
• Loss of CAT II/III
• Engine Fail
Discontinue a CAT II/III Approach below 350ft AGL when
• No LAND mode
• Incorrect Runway Course
Discontinue a CAT II/III Approach below 200ft AGL when
Red Autoland Light
Discontinue a CAT II/III Approach at FLARE height (40ft) when
No flare + No visual References
From which RVR is considered a LVTO
550m, requiring an specific approval below 400m RVR
Maximum Taxi Speed for a Low Visibility Take Off
10kts GS
Controlling RVR for a Take-Off
All Runway portions are considered controlling (TDZ/MID/END)
If the TDZ RVR is not reported, which is the controlling RVR? Can we land?
Yes, in that case MID is the controlling RVR
If the END RVR is not reported, can we take off?
No, all runway segments are controlling due to a possible rejected take-off
If the TDZ RVR is not reported, can we take-off?
In that case, a self assessment of the RVR can be visually made from the cockpit (10 lights if spaced 15m each or depending on aerodrome lights)
Minimum Visual References to continue a CAT II Approach below DH
3 consecutive lights (centerline, approach, tdz or edge) + 1 lateral light
Minimum Visual References to continue a CAT III Single (Fail Passive) Approach below DH
3 consecutive lights (centerline, approach, tdz or edge)
Minimum Visual Equipment to continue a CAT III Dual (Fail Operational) Approach below DH
1 center line light
If the reported RVR is below the minimum acceptable for an approach, can we start the approach? Until where?
Yes, until 1000ft, if the RVR is still below minimums, a go around must be performed, if the RVR is above minimums, we can continue until DH
If we are below the Approach Ban (1000ft), and the RVR conditions are below minima, can we continue the approach?
Yes, in this case we can continue until minimums because we have passed the 1000ft approach ban, if at minimums we don’t have visual reference, we go-around
What is the first signal that ground equipment has failed during a low visibility approach?
FD Bars will flash
What is the first signal that the Aircraft equipment has failed during a low visibility approach?
If the aircraft detects more than 1/4 dot LOC deviation or 1 dot G/S deviation, the LS scale will flash down to 100ft
