MTP Installation on the WB57 for CRYSTALFACE

1
MTP Installation on the WB-57 for CRYSTAL-FACE
MJ Mahoney Jet Propulsion Laboratory, California
Institute of Technology Pasadena, CA Last
Revised March 26, 2002

• MTP components are (from sky to aircraft)
• Fairing Provides microwave transparent window
  instrument
• Sensor Unit (SU) RF and Digital Hardware
• Data Unit (DU) Control and Data Storage
• WB-57 Analysis Computer (WAC) Retrieves
  temperature profile sends video signal to
  backseat display
• Cables Connect SU to DU, DU to WAC and Aircraft
  Power/Control, WAC to Backseat Display

MTP shown at 9 oclock position on right spear
pod will be rotated 180 degrees on left spear
pod for CRYSTAL-FACE.
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MTP Component Dimension, Volume, and Mass Summary
Component Length Width Height Volume
Mass (cm/in) (cm/in) (cm/in) (cm3/in3)
(kg/lb) Sensor Unit (with bracket) 24.0/10.0
12.5/5.0 16.0/6.5 5,083/325
5.2/11.5 Data Unit 20.0/8.0
35.5/14.0 10.0/4.0 7,100/448
4.2/9.2 Realtime Analysis Computer 35.0/14.0 25.0/
10.0 8.0/3.0 7,000/420
4.5/10.0 Cables 1.4/3.0 Total
19,183/1193 15.3/33.7

• Other Useful Information
• All MTP components use 6061 aluminum, and have
  received a chemical film treatment meeting
  MIL-C-5541E Class 3
• All MTP components are mounted by using 10-32
  Floating Nut Plates meeting NAS 1068A3
• Mounting hardware are NAS 3 or NAS 1303
  compatible, and are certified to gt160 ksi
• Since each component box is almost entirely
  filled and their mass 10 lbs., the center of
  gravity of each component box may be considered
  to be the geometrical center of the box.

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MTP Fairing, Sensor Unit, and Sensor Unit
Mounting Bracket on WB-57
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MTP Sensor Unit Attachment to Mounting Bracket
(Above) View of MTP in spear pod cone area with
mounting bracket seen from behind. Black cable to
Data Unit is visible going up from back of Sensor
Unit. (Right) View of the Ellington-provided
mounting bracket from the front. The MTP Sensor
Unit (show above without cover plate) mounts to
an adapter plate by four NAS 1068A3 Locking
Floating Nut Plates (Small Pattern) using
standard NAS 3 10-32 hex bolts. The adapter plate
(not shown) in turn mounts to six fixed nut
plates using NAS 3 10-32 hardware on the mounting
bracket (shown).
Mounting Bracket
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MTP Components in Spear Pod Adapter Ring and
Backseat
(Top) MTP Data Unit (DU) mounted in spear pod
adapter ring (Middle) MTP WB-57 Analysis Computer
(WAC) mounted from a plate in spear pod adapter
ring. (Bottom) Old MASP Electronics box.
A NTSC video signal from the WAC is sent to the
WB-57 back seat for display. This is used by the
backseater to have the pilot fly at specific
altitude offsets with respect to the tropopause
in order to meet science objectives.
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MTP Sensor Unit (SU) WB-57 Dimensions
MTP Sensor Unit (SU) dimensions. SU mounts from
bottom (see next image).
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MTP Sensor Unit Attachment to Mounting Bracket
Adapter Plate
9.0
MTP Sensor Unit weighs 11.5 lbs (with bracket)
and mounts to adapter plate (below) as described
earlier.
1.25
5.0
Reference Target
Bottom of Sensor Unit
2.5
1.25
4.5
2.5
2.0
Top of adapter plate is 0.060 inch thick aluminum
provided by Ellington. Sides are made of 1 inch
by 2 inch angle bracket aluminum which is 0.070
inches thick, also provided by Ellington.
Adapter Plate to Mounting Bracket (Top)
4.5
8.125
Side View of Adapter Plate, with holes for
bolting to mounting bracket.
1.25
2.0
All Units are inches Not drawn to scale
3.25
1.5
3.0
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MTP Data Unit (DU) WB-57 Installation
14.5
7.125
MTP Data Unit weighs 9.2 lbs, is made of 0.085
inch thick 6061 aluminum, and is mounted with AN3
10-32 hardware. It hangs from a Ellington
provided 0.100 inch thick aluminum plate which is
mounted to the top of a 19-inch rack in a pod
adapter ring.
To A/C
To SU
8.0
Front
1
11.25
2
Green circles are 4 DU attach points 4 open
circles are attach points for mounting plate to
19-inch rack.
MTP Data Unit (Front)
4.0
1.5
All Units are inches Not drawn to scale
14.0
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MTP WB-57 Analysis Computer (WAC) Installation
12.0
All Units are inches Not drawn to scale
2.6875
Forward
10.0
14.0
6.5
WAC Mounting Plate (0.100 inches thick)
(Mounts to 19 rack in adapter ring)
19.75
WAC (Front)
WAC box weighs 10.0 lbs, is made of 0.115 inch
thick 6061 Aluminum and is mounted with AN3 10-32
hardware. Mounting flange is 1 inch wide.
3.0
10.0