Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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CODE 67 ANGULAR ACCELERATION
(Change in angular velocity)
X Variable
y
0 Zero, V • constant
l
Increasing slowly
2 Decreasing slowly
3 Increasing fast
4 Decreasing fast
5 Increasing very fast
6 Decreasing very fast
7
8
9
CODE 69 DISAPPEARANCE BEARING
X Disappeared suddenly
y
0 N
l
Ne
2
E
3 Se
4 s
5 SW
6 w
7 NW
8
9
CODE 72
OBJECT ORIENTATION
Apparent inclination of principal
CODE 68 APPBARJ:J1TCE BEARING
X
y
O N
l
NE
2
E
3 SE
4 s
5 SW
6 W
7
NW
8
9
CODE 70-71 ELEVATION
WITH RESPECT TO GROUND1 DEGREES
Initial
Final
X Variable
X Variable
y
y
0 0-9
0 0-9
l
10-19
1 10-19
2 20-29
2 20-29
3 30-39
3 30-39
4 40-49
4 40-49
5 50-59
5 50-59
6 60-69
6 60-69
7 70-79
7 70-79
8 80-89
8 80-89
9
9
axis of object from horizontal
CODE 73 MANEUVERS
CODE 74 OBSERVER OCCUPATION
X Variable
y
0 +90° to 60°
l
+60° to 30°
2 +30° to 10°
3 +10° to 0°
4 oo
5 OQ to -10°
6 -10° to -30°
7 -30° to -60°
8 -60° to -90°
9
X
y
0
l
2
3 4
5 6
7
8
9
307
X
Y Civilian, occupation r.ot stated
O Army, military
l
NavY, military
2 Marine, military
3 Air force, military
4 Coast guard, military
5 Merchant marine, military
6 Commercial air, civilian
7 CAA, civilian
8 Government contractor, civilian
9 Civilian, other