Halifax part numbering, also taken from David Smith’s ‘High Ground Wrecks’.
57 is the basic Halifax airframe number and is used on all marks of Halifax. Changes in later marks of aircraft such as a different engine installation, different tail structure result in an updated, mark specific part number.
57 = Halifax I
59 = Halifax II
61 = Halifax III, VI and VII
63 = Halifax V
A letter is also used to denote the sub-assembly:
A = layout and charts
B = wings, ailerons and flaps
C = fuselage structure
D = undercarriage and hydraulics
E = flying controls, automatic and manual
F = tailplane, fin, rudder and elevators
H = powerplant, tanks, piping and engine controls
L = electrical and general equipment
P = ancillary (ground) equipment
Q = armourment
R = repairs
S = small standards
T to W temporary drawings related to B to Q
X = rubber sections
Y = extrusions
Z and ZH drawn sections
i.e. 57193E-2 = MkI airframe, drawings number 193, E = flying controls, 2 = starboard (odd numbers port, even numbers starboard)
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