Orbital Pegasus - Manual (Page 78)

Release 7.0 Apr 2010 67
Pegasus User’s Guide
10.26. Secondary Payload Adapters for
Nonseparating Secondary Payloads
Authorize by: L-24 months
10.26.1. 59 cm (23 in.) or 43 cm (17 in.) PA for
Nonseparating Secondary Payloads
The DPA described in Section 10.24 can be used
to accommodate a nonseparating secondary
payload. In this application, the DPA cylinder is
separated from the Pegasus launch vehicle.
Orbital will provide a nonseparating PA for use by
a secondary payload in conjunction with the DPA
described in Section 10.24. The secondary
payload and PA remain attached to the forward
flange of the Pegasus avionics section. If the
primary payload is using a 59 cm (23 in.) or 43 cm
(17 in.) PA, the 97 cm (38 in.) separation system
nominally used to separate the primary PA from
the DPA cylinder is moved to the aft end of the
cylinder. This way the cylinder and primary PA
can be separated from the launch vehicle at the
same time. If the primary payload is using a 97
cm (38 in.) PA, an additional 97 cm (38 in.)
separation system would be required at the aft end
of the cylinder. This additional separation system
is not included in the cost of this nonstandard
service. The envelope available for the secondary
payload would be dependent on the separation
characteristics of the DPA cylinder. Since this is in
turn dependent on the primary PA, a separation
and clearance analysis must be performed on a
mission-specific basis.
10.26.2. Load-Bearing Nonseparating
Secondary Payload
Pegasus can accommodate a load-bearing
nonseparating secondary payload. In this
configuration, the secondary payload bolts directly
to the forward flange of the Pegasus avionics
section. The primary PA bolts to the load-bearing
secondary payload. Orbital will coordinate with
the secondary payload on structural requirements
and mechanical interfaces required to
accommodate the primary payload adapter.
10.26.3. Secondary Payload Adapters for
Separating Secondary Payloads
Authorize by: L-24 months
10.26.4. 43 cm (17 in.) Payload Adapter
Orbital will provide the 43 cm (17 in.) PA described
in Paragraph 10.23 for use by a secondary
payload in conjunction with the DPA described in
Section 10.24.
10.26.5. 59 cm (23 in.) Payload Adapter
Orbital will provide a standard 59 cm (23 in.) PA
for use by a secondary payload in conjunction with
the DPA described in Section 10.24.