Low Visibility Flashcards
Definition contaminated runway
> 25% of required rwy (length and width) covered with:
- > 3mm water, slush or loose snow
- compacted snow
- ice or wet ice
Low Vis T/O if
RVR < 400 m
Which elements have to be functioning for T/O less than 400m but more than 300 m ?
REDL and RCLM (day)
REDL and RENL (night)
RCLL and RENL (night)
Touchdown zone
900m from threshold
Runway edge lights spacing?
200 ft (60m)
Runway edge light change color at the end?
2000ft (600 m) before DER they turn amber
Runway centerline lights change color at the end?
Alternating red / white between 900m and 300 m (3000 ft and 1000ft)
Red last 300m (1000ft)
Hierarchy of reported visibility
RVR
Aerodrome visibility
Pilot observed visibility
Standard Minimums- Decision Height / RVR
Cat I 200 ft / 550 m
Cat I LTS 200ft / 400 m
Cat II 100 ft / 300 m
CatIIIA <100 ft / 200 m
Cat IIIB <100 ft / 150 m
<50 ft / 125 m
No DH / 75 m
Minimum RVR for T/O?
125 m
For a take off below 200 m consider following:
Low vis in force
Pilots trained
Check for country restictions
RL including edge lights CL RVR for all relevant sectors CM 1 PF Max crosswind 25 kts Rwy not contaminated Auto brake System
Reset of DH in case of malfunction allowed down to
1000 ft AGL
Below alert height (200ft AGL) go around if
Any master caution with warning occurs:
No autoland
Autopilot
Autothrottle disc
Speedbrake extended
ATC phrasiology if TO is delayed on rwy
„rolling“ should be used to announce the take off roll
TO alternate if
The weather at departure aerodrome is below one-engine out minimum
Shall be located within 435 NM
Autoland / CM 1 PF compulsory for
Cat I LTS
Cat II (manual landing also ok)
Cat III
Required visual reference to continue below DA
Non-precision, Cat I, LTS Cat I
- Elements of the APL
- rwy threshold markings or lights
- Visual slope indicator (VASI, PAPI etc)
- TDZ markings or lights
- rwy edge lights
Manual landing on Cat II approach?
Yes, if autoland not available
Required visual reference to continue below DA
Cat IIIa
At least 3 consecutive lights or a combination of these:
Centerline of APL
TDZL
rwy CLL
REDL
and maintained
Required visual reference to continue below DA
Cat IIIb with DH
One element of CLL is attained and maintained
Required visual reference to continue below DA
Cat IIIb without DH
Decision to continue does not depend on visual reference
Alert Height is
Height above which a CatIII would be aborted in case of malfunction.
Below AH landing would be made unless alter is accompanied by master caution
What is the alert height for a B777?
200 ft
MABH
Minimum approach break-off height s 25ft for the B777
