M
Missed approach
A
Airspeed +-10 knots or 5% change of filed TAS
R
Reaching a holding fix - report time and altitude
V
For on top
E
Eta - change +-3 min (required only in non radar environment)
L
Leaving a holding point/fix
O
Outer marker (required only in non radar environment)
U
Unforecasted weather
S
Safety of flight
V
Vacating an altitude or flight level
F
Final approach fix (required only in non radar environment)
R
Radio / nav failure
C
Compulsory reporting points (required only in non radar environment)
500
Unable to climb or descend 500 fpm