@Takwis - Thanks for responding
. So no aerodynamic impact. Solved. @PEI_3721 thanks for your time.
Edit1: After PEI's response to Takwis's post I tried to dig up one of my images to put us on a level 'playing field'.
A0283
Edit2: In PEi's http://www.aerospaceweb.org/question...cs/q0255.shtml the dual strakes are visible on its 1st photo. The article says the big strake is on the -600 upto -900.
@Takwis - Could you tell me what the names of the big strake, the small strips, and the trapdoor are in 'Boeing speak'.