FLEX45 SRS Runway?

[Localiser Green]

I have heard this call after power application during takeoff on Airbus A320/330 types.

I assume these are FMA callouts, and FLEX45 (or TOGA) is the power setting, but can any Bus driver enlighten me on what "SRS" and "Runway" mean? Thanks.

[MachineMan]

Greetings Loc green,

you were right on spot concerning the "flex" meaning.
SRS means speed reference system which is responsible for maintaining min. V2+10 (2-eng) or current speed or V2 (whichever is higher) OEI. Included is also an attitude protection, windshear protection and flight path angle protection. It disengages automatically at acc.alt or at FCU-selected altitude or manually.
RWY guides the aircraft on rwy centerline for the t/o-roll and initial climb to 30ft if a LOC signal is available on the runway.

Hope this helps,

MachineMan

[Localiser Green]

Thanks MachineMan just what I needed to know. :cool:

[Manflex55]

A few additional things :

MAN FLEX45 indicates that:
- the A/THR is armed (but not engaged)
- the most fwd thrust lever is in FLX/MCT
- & a FLEX T° of 45 has been entered on the PERF>TO page

SRS :
- regulates the spd in order to maintain a MIN ROC of 120fpm
- is only available when FDs are ON & flaps are 1 or greater

RWY is accompanied by the Gnd Roll Guidance Command Bar: if the bar is centered, the a/c is on crs to intercept & fly the LOC to 30', but it won't NECESSARILY B the extended rwy centerline.
The LOC must B received to engage, but if it is lost anyafter, the a/c will fly a memorized trk.

MF

[ 23 October 2001: Message edited by: Manflex55 ]