1 This British Standard specifies the requirements for two grades of electrically-heated pitot and pitotstatic heads for aircraft.
Grade A, heads fully de-iced and suitable for high speeds.
Grade B, heads not suitable for flight in severe icing conditions.
2 Grade A comprises two classes of head:
Class 1, heads not compensated for pressure error.
Class 2, heads compensated for pressure error.
3 Grade B heads will normally be of the non-compensated type.
BS 2G 135:1967 history
0000 BS 2G 135:1967(2009)
1967BS 2G 135:1967 Specification for electrically-heated pitot and pitotstatic pressure heads