Model Variants (Including Prototypes)
L-1 "Vigilante" - Base Series Designation
Model 74 - Company model designation
YO-49 - U.S. Army evaluation designation
O-49 Vigilant - Initial production models; 142 built
O-49A Vigilant - Extended fuselages; 182 examples completed.
O-49B Vigilant - Air ambulance model; up to four converted.
L-1A Vigilant - 1942 redesignation of O-49A models
L-1B Vigilant - Redesignation of O-49B models
L-1C Vigilant - Air ambulance based on L-1A
L-1D Vigilant - Training glider tug based on L-1A
L-1E Vigilant - Amphibious Air Ambulance based on L-1
L-1F Vigilant - Amphibious Air Ambulance based on L-1A
Vigilant Mk I - RAF designation for L-1 models
Vigilant Mk II - RAF designation for L-1A models
CQ-2 Vigilant - USN target control aircraft variant