System 112A - The Black Vault

~-~_~·=~.~_~.'=~·Ia______~~=~ern
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SYSTEM JJn~&
The sequence of events for the flight of No. 4783
,s as follows:
Time in Seconds
Range Coincidence (Turbine Arm) -56.1
IRCS Test to Normal -54.0
Turbi.ne Fire -31.1
External to Internal Power Transfer -17.9
Enable (Angular Coincidence Circuit - 0.68
Armed)
Angular Coincidence - 0.65
Gyro Uncage - 0.55
Release (Automatic Checkout System) - 0.22
Release (Umb1l1cal) - 0.1
Release (Lanyard) 0.0
First Indication of Abnormal 0.7
Electrical System
Rocket Fire 1.7
Full Thrust Attained 3.1
Relay Antenna Returns to Normal 10.0
Operation
Altitude Controller COMected
3O.S
Electrical Shutdown 78.8
Power Plant Shutdown 79.0
MC-5 Manifold Baroswltch (12,000 ft) 172.35
MC-5 Probe Baroswitch (12,000 ft) 172.86
MC-5 Manifold Baroswitch (10,000 ft) 176.23
MC-5 Probe Baroswitch (10,000 ft) 176.33
Impact 191.3
d. GAM-63A No. 4891
Missile No. 4891 was transferred to HADC on
30 January 1957. Following receiving inspection, the
missile and DB-47 No. 51-5220 were prepared for a
scheduled launch flight.
The launch mission of 7 March was cancelled
when command contact could not be established. The
trouble was attributed to intermittent control of the
director aircraft (ATRAS) antenna. On 11 March,
subnormal L-band beacon tracking by the MIRAN
(master ground tracking statlon) resulted in a "hold"
being placed on the launch mission at X-3 minutes.
Postflight investigations trac~ the problem to a defective
beacon antenna connector.
On 13 March 1957, DB-47 No. 51-5220 and GAM­
No. 4891 became airborne at 0625 hours MST. In the
climb to altitude (Figure oi), beacon and video. checks
were performed satisfactorily. During the command
checks, the operator experienced difficulty In retaln-
Figure 4. GAM-63A Missile and DB-47 Director Aircraft
Report No. 56-981-021-48 17
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