the RAF F4s outer wings were mechanically lowered and locked
RAF Phantom FG1 outer wings had a hydraulic mechanism for raising, lowering and
locking the outer wings. They had additional mechanical locks that were screwed in or out as required from underneath the wing using a speed brace and bit.
In the unlocked position, the mechanical lock raised a tell tale cylinder on the upper surface of the wing that was marked with dayglow and about 1 inch tall. This was checked on every walk round and every see off I ever saw. Apart from Q launches maybe...
There was an out of phase servicing that called for the wings to be functioned 6 times to recirculate the hydraulic fluid retained in the components to prevant stagnation due to lack of use.
I know this cos I've Phixed a few of em! Happy days!
