New Normal 737 Procedures

[Edwin Yii 0]

17 Feb 2006 - Following the 14 August 2005 737-300 accident outside of Athens, Greece, at the request of and with the concurrence of the U.S. Federal Aviation Administration (FAA) and the Hellenic Air Accident Investigation and Aviation Safety Board (AAIASB), Boeing has identified several enhancements to the flight crew procedures associated with the 737 Cabin Altitude Warning System. Boeing is providing advanced notice of these revisions which will be published in the following block revisions:

 

737-600/700/800/900 March 2006

737-200/BBJ April 2006

737-300/400/500 June 2006

 

These block revisions will include the following changes:

1. Add the following checklist item to the PREFLIGHT NC after the item "Window heat . . . . . . . On":

 

Pressurization mode selector. . . . . . . . . . . . . AUTO

 

2. Delete the CONFIGURATION WARNING NNC from QRH Sections 0 and 15.

 

3. Add the new WARNING HORN - CABIN ALTITUDE OR CONFIGURATION NNC to QRH Sections 0 and 15.

 

All steps in this NNC are recall.

 

 

WARNING HORN - CABIN ALTITUDE OR CONFIGURATION

 

Condition: An intermittent or steady warning horn sounds:

 

* In flight an intermittent horn indicates the cabin altitude is at or above 10,000 feet.

* On the ground an intermittent horn indicates an improper takeoff configuration when advancing thrust levers to takeoff thrust .

* In flight a steady horn indicates an improper landing configuration.

 

If an intermittent horn sounds inflight:

 

OXYGEN MASKS AND REGULATORS . . . . . . . . ON, 100%

 

CREW COMMUNICATIONS. . . . . . . . . . . . ESTABLISH

 

Do the CABIN ALTITUDE WARNING OR RAPID DEPRESSURIZATION checklist.

 

If an intermittent horn sounds on the ground:

 

Assure proper airplane takeoff configuration.

 

If a steady horn sounds inflight:

 

Assure proper airplane landing configuration.

 

 

4. Revise FCOM/QRH warning horn terminology to state:

 

cabin altitude/configuration warning horn

 

 

 

cheers..and hope this will be helpful!

[Min Chun 0]

Sorry..may I know more about the 'horn' ?

Thanks..Cheers

[Edwin Yii 0]

warning sound..like if u forgot to lower the gear...at flaps 15?

somthing like tat ..

[Peter Smith 1]

Wicked stuff, Edwin!

[Walter Sim 1]

I heard the horns just now as i was flying the WilcoPub 737.

 

it was annoying....

[simon T 0]

the QRH..along with FCOM vol.1 ,vol.2,MH ops supplement are updated..the new recall items are quite redundant actually..every 737 pilot should be able to distinguish the landing config warning and the cabin alt warning horn in-flight..but i guess boeing is trying to be 'extra' safe after the helios accident which could've been simply avoided by proper training..

[simon T 0]

Sorry..may I know more about the 'horn' ?

Thanks..Cheers

 

the "annoying" horn comes on when you're not in a proper take off config and you have increased the thrust on the GRD to the extent of activating the horn..e.g speedbrake handle not stowed,parking brake set,LE devices not configured for t/o,flaps not in t/o posn,and stab trim not in the green band..

 

the horn also comes on during flight(a steady horn,similar to the t/o config horn) if you have not put down the LDG with flaps deployed..

 

when the flaps are between 1 to 10 with the thurst levers between idle and approx. 10 degrees thrust lever angle..it can be silenced with ldg gear warning horn cutout switch..with the flaps at 15,u can also silence the horn with either thrust levers between idle and 10 degrees while the opposite thrust lever is greater than 30 degrees..but with both thrust levers below 30 degrees..the horn cannot be silenced and u must lower the ldg.(usually we dont come to that situation..coz according to the NP we put the gears down 1st before lowering the gear at g/s capture)..and then after flaps 15,the horn will just sound like there's no tomorrow..'less u put the gears down or u pull out the corresponding circuit breaker..

 

complicated ? this is just part of being a pilot..

 

[Chan CS 0]

Are you a pilot? Simon T?

[simon T 0]

yes my friend

[Min Chun 0]

Simon..quite complicated for me.But will try to understand it..

Thanks for the clarification anywyas:)

 

Chan, Simon is with ANA

 

 

 

[simon T 0]

dude....nono..i'm with the national carrier..

[Chan CS 0]

wuhu~~ One more pilot in this forum!!

[Min Chun 0]

dude....nono..i'm with the national carrier..

 

Oops..Blur already and being mad..

With MAS?

[simon T 0]

yup..with MAS..

cheers to all the fellow MH pilots in this forum! and u all too!