Loosing a primary INS
Posted: Wed Oct 07, 2015 11:35 pm
Loosing #1 or #2 INS will fail the subsequent attitude indicator which leads to autopilot 1 (or 2 respectively) disconnect.
If you don't react fast the aircraft at FL500+ and Mach 2 can get easily out of control by hand flying.
It happened to me at dark (minimal sense of visual horizon) crossing from Lebanon to Syria over desert !
If it happens this is a quick remedy before you loose control:
If you fly on Autopilot 1 and and loose INS1
Flip all captain side switches to the other side, engage Autopilot 2 (using INS2) and Authrottle 2 and from there onwards fly as copilot (i.e. starboard side HDG controller for heading) and monitor copilot's HSI, not the captain's. Captain's Attitude Indicator will be fed by No.2 INS.
If you fly on Autopilot 2 and loose INS 2 do the opposite from the above, flip copilot's side switches and continue flight with Captain's instruments on Autopilot 1 and Autothrottle 1.
The subject flight:
PIREP:
http://www.oav.gr/pages/fskeeper/PIREPD ... ?ID=208745
Map:
http://www.oav.gr/oavacars/map/index.asp?id=208745
VATAWARE:
http://www.vataware.com/flight/5613e6435352333ac500000a
CIVA INSs have their own failure factors that can not be disabled like the failures of FSLabs for the aircraft. Once in a while they may fail but its rare !
If you don't react fast the aircraft at FL500+ and Mach 2 can get easily out of control by hand flying.
It happened to me at dark (minimal sense of visual horizon) crossing from Lebanon to Syria over desert !
If it happens this is a quick remedy before you loose control:
If you fly on Autopilot 1 and and loose INS1
Flip all captain side switches to the other side, engage Autopilot 2 (using INS2) and Authrottle 2 and from there onwards fly as copilot (i.e. starboard side HDG controller for heading) and monitor copilot's HSI, not the captain's. Captain's Attitude Indicator will be fed by No.2 INS.
If you fly on Autopilot 2 and loose INS 2 do the opposite from the above, flip copilot's side switches and continue flight with Captain's instruments on Autopilot 1 and Autothrottle 1.
The subject flight:
PIREP:
http://www.oav.gr/pages/fskeeper/PIREPD ... ?ID=208745
Map:
http://www.oav.gr/oavacars/map/index.asp?id=208745
VATAWARE:
http://www.vataware.com/flight/5613e6435352333ac500000a
CIVA INSs have their own failure factors that can not be disabled like the failures of FSLabs for the aircraft. Once in a while they may fail but its rare !