B737NG AP AND ROLL MODE DISCONNECT

[Pin Head]

Hi

Been flying in some lumps and bumps recently and done may best to avoid but we still hit some returns.

Had HDG SEL disconnect to CWS R and then a full AP disconnect with the FCC simply not being able to cope.

Is this semi normal for the older NGs to say no more in these monsoon build ups?

Any others had similar encounters?

Thank you

[underfire]

When you say older NG, what variant are we looking at here?

[Avenger]

Boeing recommend setting Turb N1 and use of CWS in heavy turbulence or if penetration of cells is unavoidable. It's not uncommon for the AP to disconnect when the demand for roll and pitch control is outside the control limits. Surf the bumps as they say!

[Pin Head]

Great stuff, it was more for low level weather dodging and in the approach area.

Very high ZFW give limited holding fuel before moving onto alternate hence the 'surfing'

[Skyjob]

Joy, but yes it's normal behaviour