In the ex Thai Air Force Dimonas we have always used petroleum based hydraulic fluid and we buy the seals from a local aircraft mechanic.
The Thais may have changed the fluids and seals so as to be standard with their other aircraft. Or, more likely they put the wrong fluid in and created a big mess. I think (but *NOT s*ure) that Michael is correct that the standard aircraft Cleveland seals can cope with DOT 3 as well as hydraulic fluid. Once the wrong fluid has been added the system would need a big flush and all seals replaced. regards Rob Rob Thompson 0429 493 828 On Tue, Jan 5, 2021 at 12:18 PM Kurt Redinbaugh <[email protected]> wrote: > Thank You Rob for your prompt response on my brake caliper question. > I am a bit confused though... > On pp44 of the HOFFMANN AIRCRAFT "instructions for continued > airworthiness" it emphatically states that DOT 3 brake fluid is used and > that MIL-5606 is NOT to be used. My brake reservoir had a red tint to it > when I put S/N 3660 back into service after 12 years as a hangar queen. > Last week I had a leak that drained the reservoir full of DOT 3. The > airplane is tied down on the ramp at the Reno-Stead airfield and is > completely covered. The weather has been freeze-thaw cycles lately. The DOT > fluid I used was fresh and stored in a factory sealed container. I have > ordered O ring number 101-02300 from Aircraft Spruce to replace the failed > seal in the caliper. > I have seen in the DOG that MIL-5606 fluid is to be used. Is there an > explanation for this seeming contradiction? > As always thanks for your support > Kurt >
