I found this reading an "Emergency descent" article for the 737NG
"Remember that use of speedbrakes at speeds in excess of 320 kts could result in a severe vibration which, in turn, could cause extreme damage to the horizontal stabilizer"
The speed restriction was of 300kts on acfts without stiffened elevator tabs. The tabs have been stiffened since Sep 06 (SB-737-55A1080). Best way to tell - if the tabs have
Six hinges, they have been stiffened. If they have
four, they have not yet been stiffened
Doesn't one get an amber light with speedbrakes extended with flaps greater than 10?
That is
below 800 ft RA