CRJ200 Airline Pilot

The personal experiences, thoughts of an CRJ captain

CRJ200 – Source Selector Panel (SSP)

Posted by Jeffrey on September 13, 2008

Source Selector Panel

Source Selector Panel

The Source Selector Panel is located on about the middle of the center pedestal. It is one of the more confusing panels because of how it works and when you use it. One way to use it is to think of it as your (Single) Source Selector. In the event that your attitude/heading, air data, EICAS or display control panel fails, you can use an alternate source for the disabled system.

There are four different switches:

  • ATT HDG Switch
  • AIR DATA Switch
  • DSPL CONT Switch
  • EICAS Switch

Each switch, except the EICAS Switch, has three positions: 1, NORM, and 2. The EICAS Switch also has three positions but they are labeled: ED1, NORM, and ED2.

 

Obviously NORM is the normal position of the switches, but what happens when you move the switch from NORM to 1 (ED1) or NORM to 2 (ED2)?

 

We will talk about each one in turn.

 

ATT HDG Switch

 

When NORM is selected, the pilot and copilot electronic flight displays receive data from their individual attitude heading references systems.

 

When ‘1’ is selected, the pilot and copilot electronic flight displays receive data from AHRS 1 only. An amber source message is displayed on the PFD and/or MFD.

 

When ‘2’ is selected, the pilot and copilot electronic flight displays receive data from AHRS2 only. An amber source message is displayed on the PFD and/or MFD.

 

AIR DATA Switch

 

When NORM is selected, the pilot and copilot electronic flight displays receive data from their individual air data computers (ADCs).

 

When ‘1’ is selected, the pilot and copilot electronic flight displays receive data from ADC 1 only. An amber ADC1 message is displayed on both PFDs.

 

When ‘2’ is selected, the pilot and copilot electronic flight displays receive data from ADC2 only. An amber ADC2 message is displayed on both PFDs.

 

DSPL CONT Switch

 

When NORM is selected, the pilot and copilot Display Control Panels (DCPs) control their respective electronic flight displays.

 

When ‘1’ is selected, the pilot DCP controls the pilot and copilot electronic flight displays. An amber source message is displayed on both PFDs and MFDs.

 

When ‘2’ is selected, the copilot DCP controls the pilot and copilot electronic flight displays. An amber source message is displayed on both PFDs and MFDs.

 

EICAS Switch

 

If either EICAS display fails, the operative ED can be used to present all EICAS information. This is accomplished by using the three-position EICAS selector knob on the source selection panel. The EICAS switch positions are designated ED1, NORM, and ED2.

 

If ED1 fails, moving the EICAS selector knob to the ED2 switch position  will allow all EICAS pages to be accessed through the reactivated EICAS Control Panel (ECP); however, only one page can be viewed at a time.

 

If ED2 is inoperative, selecting the knob to ED1 allows all EICAS information to be viewed on ED1.

 

If the only operative ED is displaying a status, synoptic, or menu page and the Data Concentrator Unit (DCU) generates a warning message, the ED automatically reverts back to the primary page and all aural alerts associated with the warning message sound.

 

Data Concentrator Unit (DCU) – processes the information that is presented on the EICAS display (ED1 and ED2).

 

Here is a brief synopsis of the Source Selector Panel

 

· “(Single) Source Select”

· ALWAYS SELECTS OPERABLE SOURCE on this panel

· Selecting ED1/2 on SSP “UNLOCKS” remaining screen so you can use ECP to select different synoptic pages

· PRI page is “PROTECTED” when on either ED1 or 2 with SSP NORM

· PRI page will be “UNPROTECTED” when select ED1/2 on SSP

· If ED2 fails:

 

1. Select ED1 (You can now scroll through synoptic pages on ED1)

2. If on other than PRI page and WARNING occurs, will revert automatically to PRI page

3. If on other than PRI page and CAUTION occurs, will NOT revert to PRI page, but will still get single chime and MASTER CAUTION

 

· If lose both ED1 and ED2 with 1 MFD set to EICAS – PRI page NOT protected

· If lose both ED1 and ED2 with 2 MFD’s set to EICAS – PRI page reverts to PIC side and it is protected

 

I have never had any displays fail, so the chances that this will happen to you is very slim but now you have the tools to get the information you need if a display does fail. As always, refer to your QRH for specific actions to take if it does occur.

 

Till next time…


Turbojet Systems Made Easy DVD – If you’re preparing for airline interviewing and testing and haven’t flown “heavy iron” lately, you really need this course!

 

 

 

 

 

 

 
 
 
 
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