Recall Pack Light (b738)

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Recall Pack Light (b738)

Postby thearas » 03 Oct 2015, 04:52

hi,
we have a problem with l/h pack. when we disconnect the connector from TCV pack light does not illuminates while pressing the recall and cockpit temperature is too cold in cruise.
we swapped both acau, pack&zone cont. , all sensors, stdby tcv,flight deck trim air modulating valve replaced, both panels swapped and replaced tcv nothing changed. wiring checked controlled no fault observed. A/C does not open tcv or stdby tcv anyway. pack temperature is nearly 15 degree. :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?: :?:

Thx for your help.
thearas
 
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Joined: 31 Mar 2012, 21:48

Re: Recall Pack Light (b738)

Postby motortek » 04 Oct 2015, 16:45

i think your ducts leaks air because of that enough hot air is not coming ..first off all open fwd cargo aft access panels and check all ducts about leakage.
motortek
 
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Re: Recall Pack Light (b738)

Postby thearas » 06 Oct 2015, 18:14

TCV does not open anyway
thearas
 
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Re: Recall Pack Light (b738)

Postby airsamet » 11 Oct 2015, 23:40

pls check d44161 connector
airsamet
 
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Re: Recall Pack Light (b738)

Postby avionic » 12 Oct 2015, 14:20

We have same problem 1 year ago (PZ controllers, sensors, TCVs were checked and replaced, heat exchangers were cleaned -----all actions without result).
Trim air pressure regulating and shutoff valve was replaced. Problem is solved.
Don't drink and drive, let smoke and fly :-)
avionic
 
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Location: Ukraine

Re: Recall Pack Light (b738)

Postby avionic » 12 Oct 2015, 14:24

Check Trim Air PRSOV during pack operation.
Good Luck!
Don't drink and drive, let smoke and fly :-)
avionic
 
Posts: 24
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Location: Ukraine

Re: Recall Pack Light (b738)

Postby airsamet » 15 Oct 2015, 15:51

LEFT FMS replaced and failure solved. The TCV taken "PACK IS OFF" information from FMC. Related cable is ground in FMC box 8-)
airsamet
 
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Re: Recall Pack Light (b738)

Postby yayoo » 20 Oct 2015, 04:53

airsamet wrote:LEFT FMS replaced and failure solved. The TCV taken "PACK IS OFF" information from FMC. Related cable is ground in FMC box 8-)


Where is the WDM or SSM?
yayoo
 
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Re: Recall Pack Light (b738)

Postby scetin61 » 23 Oct 2015, 01:47

usefull information, thanks samotelli :D
scetin61
 
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Re: Recall Pack Light (b738)

Postby slacker » 25 Nov 2015, 21:58

Hey Noomi, why did you quote me in this post and not give me credit for the quote?
slacker
 
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Re: Recall Pack Light (b738)

Postby gorge » 19 Nov 2017, 14:02

Pls see AMM SDS 21-60-00, "The TRIM AIR switch is in the ON position for normal operation. This causes
the Trim Air Pressure Regulating and Shutoff Valve (PRSOV) to open and
regulate the pressure in the trim air ducts to approximately 4 psi above the
cabin pressure". if PRSOV fail, no trim air to cabin, makes cabin cold.
gorge
 
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