Orbital Minotaur VI - Manual (Page 99)

Minotaur IV • V • VI User’s Guide Section 8.0 – Optional Enhanced Capabilities
used within the encapsulated volume have
outgassing characteristics of less than 1.0% Total
Mass Loss (TML) and less than 0.1% Collected
Volatile Condensable Mass (CVCM) in
accordance with ASTM E59. If materials within the
encapsulated volume cannot meet low outgassing
characteristics because of unique mission
requirements, a contamination control plan is
developed to ensure controls are in place to
eliminate any significant effect on the payload.
8.6.2. High Cleanliness Integration
Environment
With the enhanced contamination control option,
the encapsulated payload element of the vehicle
is processed in an ISO Standard 14644-1 Class
10,000 environment during all payload processing
activities up to fairing encapsulation (ISO 7). The
Payload Processing Facility (PPF) clean room
(Figure 1.6.6-2) utilizes HEPA filtration units to
filter the air and ensure hydrocarbon content is
mai
ntained at ≤15 ppm, with humidity maintained
at 30-60% relative humidity. Depending on
payload requirements, the clean room can also be
certified as Class 100,000 (ISO 8) while still
providing tighter environmental control than the
standard high-bay environment, thereby streamlining access and payload processing.
8.6.3. HEPA-Filtered Fairing Air Supply
With the enhanced contamination control option, the ECU continuously purges the fairing volume with
clean filtered air while maintaining temperature, humidity, and cleanliness. Orbital’s ECU incorporates a
HEPA filtration unit along with a hydrocarbon filter adaptor to provide Class 10,000 (ISO 7) air and ensure
hydrocarbon content is maintained at ≤15 ppm, with humidity maintained as stated in section 4.6.1.
Orbital monitors the supply air for particulate matter via a probe installed upstream of the fairing inlet duct
prior to connecting the air source to the payload fairing.
8.6.4. Fairing Surface Cleanliness
The inner surface of the fairing and exposed launch vehicle assemblies are cleaned to Visibly Clean Plus
Ultraviolet cleanliness criteria which ensures no particulate matter visible with normal vision when
inspected from 6 to 18 inches under 100 foot candle incident light, as well as when the surface is
illuminated by black light at 3200 to 3800 Angstroms. Process and procedures for inspection and the
bagging of material to preclude contamination during shipment to the field are in place.
8.7. Secure FTS
The Secure FTS (Figure 8.7-1) is achieved with the L-3 Cincinnati Electronics Model CRD-120/205
Launch Vehicle Command Receiver/Decoder that is compatible with the "High-Alphabet" range safety
modulation format. The receiver uses a pre-stored code unique to each specific vehicle to issue
Figure 8.6-1. Minotaur Team Has Extensive
Experience in a Payload Processing Clean
Room Environment
Release 2.0 June 2013 84