Wing Mounted Canisters

On both the port and starboard wings, the BAE146 carries canisters which are fixed to centrally mounted wing pylons. These canisters are used to 'house' the externally mounted probes (such as in-situ cloud physics, aerosol or turbulence probes). There are 4 canisters on each wing (upper inner, upper outer, lower inner and lower outer) with the potential for a 5th if the 'base' position  is used. The canisters were manufactured by Particle Measuring Systems (PMS) and (more recently) by Droplet Measurement Technologies (DMT) of Boulder, USA. They are designed to carry PMS/DMT style instruments and are approximately 28" long (without dummy head) with a diameter of 7". The weight of the PMS designed canisters is approximately 17lbs (7.7kg) without a dummy head. A dummy head brings the weight up to approx. 20lbs (9.1kg). The DMT designed canister weighs approximately 14lbs (6.4kg) without a dummy head, and approx. 15.5lbs (7kg) with.
Each instrument canister has two Amphenol 26-190-24 and two 26-190-8 connectors arranged as shown in the 'Wing Canister Plug Locations' image above. This arrangement allows individual instruments to be orientated in the preferential manner. For example, a probe can be mounted with the sample arms in a horizontal or vertical position. When mounted, the instrument's mating connectors fit securely into the canister connectors.
 
Table 1 shows the signal allocation from the Amphenol canister connectors to the flying lead. Each pin of the canister connector goes to both of the relevant 90° oriented Amphenol connectors.
 
 
Table 1: Signal allocation from canister to flying lead.
Amphenol (type) 6026-16-26PN
Standard Instrument Canister Canister Signal Flying Lead
Pin Signal Colour Pin
1 (26-190-24) SIGNAL+ N/A A
13 (26-190-24) SIGNAL- N/A B
2 (26-190-24) SIGNAL+ N/A C
14 (26-190-24) SIGNAL- N/A D
3 (26-190-24) SIGNAL+ N/A E
15 (26-190-24) SIGNAL- N/A F
4 (26-190-24) SIGNAL+ N/A G
16 (26-190-24) SIGNAL- N/A H
5 (26-190-24) SIGNAL+ N/A J
17 (26-190-24) SIGNAL- N/A K
6 (26-190-24) SIGNAL+ N/A L
18 (26-190-24) SIGNAL- N/A M
7 (26-190-24) SIGNAL+ N/A N
19 (26-190-24) SIGNAL- N/A P
8 (26-190-24) SIGNAL+ N/A R
20 (26-190-24) SIGNAL- N/A S
9 (26-190-24) SIGNAL+ N/A T
21 (26-190-24) SIGNAL- N/A U
11 (26-190-24) SIGNAL+ N/A V
23 (26-190-24) SIGNAL- N/A W
1 (26-190-8) SIGNAL+ N/A X
5 (26-190-8) SIGNAL- N/A Y
2 (26-190-8) SIGNAL+ N/A Z
6 (26-190-8) SIGNAL- N/A a
  Overall screen - b
  Nc N/A c
 
Table 2 shows the power allocation from the Amphenol canister connectors to the flying lead. Each pin of the canister connector goes to each of the relevant 90° oriented Amphenol connectors. Pin D and E (28V supply) should not be connected directly to a common source as separate control over these supplies is required.
 
Table 2: Power allocation from canister to flying lead.
Amphenol (type) 6026-18-8PN
Standard Instrument Canister Canister 115VAC Flying Lead
Pin Power Colour Pin
12 (26-190-24) 115VAC 400Hz N/A B
24(26-190-24) RETURN N/A A
4 (26-190-8) 115VAC 400Hz N/A G
8(26-190-8) RETURN N/A F
10 (26-190-24) 28 Volts N/A D
22(26-190-24) Return N/A C
3 (26-190-8) 28 Volts N/A E
7(26-190-8) Return N/A H
 
Cabling supplies 10 Amps of 115V 400Hz electrical power to each of the canisters (5 Amps + 5 Amps). Cabling also supplies up to 10 Amps of 28V DC electrical power to each of the canisters with two separate supplies. Either 5 Amps to be supplied via pin E or 10 Amps via pin D, as selected from the cloud physics console. The power connections should be terminated on 6020-18-8SN-type connectors (one per canister) on the same plug breaks as the signal connectors. Power is routed via the cloud physics console. Pins A and B at the canister connector can be made common to pins F and G respecively to save cable laying if desired, as long as the cable routing the power can carry the full 10 Amps. Similarly, pins C and H can be made common at the canister connector. Pins D and E must remain separate.

Flying lead to console data transfer

There is provision for 12 screen twisted pairs for each canister with RS422 grade cable to transfer data to the cloud physics console. The signal cables are terminated with 6020-16-26SN-type connectors (one per canister) both within the cabin area and at the canisters. The termination point within the cabin is on the plug break on the top face of the cloud physics console. These are then fed back out to a 25 way D type connector. External canister signal cables should be plugged into the 602 connectors, whilst the internal signal cables (to DAU) should be plugged into the appropriate 25 way D connectors, corresponding to the canister that the instrument has been fitted to.

Further information

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Original text written by Dr Kate Turnbull, 2008. Updated & modified by Angela Dean, 2010. 2015, January 2016.