Browse Compass Gauges & Fluid in the Wicks Aircraft Supply catalog including PAI-700 Vertical Card Magnetic Compass,Brass Compass Screwdriver,Airpath 2 1/4' Compasses,Compass Kits with or without Compass Fluid,Compass Fluid,Ritchie Trek (Bracket Moun.

The Airpath compass is meant to work in a fluid filled chamber. A bubble is an annoyance.

Tetra whisper 30 60 filter manual. A leak leaves you with a trembling indicator that won't indicate a heading with any reliability. Gasket and fluid kits are not that high.

From Chief etc. $20-$30 If caught short, don't try making a rear diaphragm from a truck inner tube, and refilling with lamp oil. The oil swells the diaphragm, and a week later, it's leaking again.

The construction is a cast barrel with a front gasketed glass, and a rear rubber diaphragm. The glass face can be chipped by too enthusiastic attempts to lift it out. It's helpful to use a little gasket cement on the front and back gaskets.

The filler screw has a sealing washer.It's best filled with a throw-away syringe. Fill to the top. Screw closed. Turn several ways. Look for the air bubble.

Three or four times. You finally get lucky, with no bubble at all.

Leave it standing face down overnight, and look for sweating. If you see any sweating, you still have a leak.

The glass face is held onto its thin gasket by a face plate with a cork gasket under it. You snug the face plate down but don't over tighten, else the inner gasket can squeeze out.

Even worse, watch out for the cover plate screws on the adjusting magnets. If these screws are too long, they force the face plate away from the glass, and.it leaks again. If the worse comes to the worst - a replacement unit is $110-$130 from the aero suppliers. Brian Whatcott. On Nov 8, 11:14*am, brian whatcott wrote: The Airpath compass is meant to work in a fluid filled chamber. A bubble is an annoyance. A leak leaves you with a trembling indicator that won't indicate a heading * with any reliability.

Gasket and fluid kits are not that high. *From Chief etc. $20-$30 * If caught short, don't try making a rear diaphragm from a truck inner tube, and refilling with lamp oil. The oil swells the diaphragm, and a week later, it's leaking again. The construction is a cast barrel with a front gasketed glass, and a rear rubber diaphragm. The glass face can be chipped by too enthusiastic * attempts to lift it out.

It's helpful to use a little gasket cement on the front and back gaskets. The filler screw has a sealing washer.It's best filled with a throw-away syringe. Fill to the top.

Screw closed. Turn several ways. Look for the air bubble. Three or four times. You finally get lucky, * with no bubble at all. * Leave it standing face down overnight, and look for sweating. If you see any sweating, you still have a leak.

The glass face is held onto its thin gasket by * a face plate with a cork gasket under it. You snug the face plate down but don't over tighten, else the inner gasket can squeeze out. Even worse, watch out for the cover plate screws on the adjusting magnets. If these screws are too long, they force the face plate away from the glass, and.it leaks again.

If the worse comes to the worst - a replacement unit is $110-$130 from the aero suppliers. Brian Whatcott For a homebuilt that certainly works but for certified aircraft I have to ask two questions. Are you a FAA certified instrument technician? If you are not then you cannot 'legally' work on the compass no matter how dirt simple it is. Did you 'swing' the compass after working on it? One technique for filling with no bubbles is to submerge the compass in a small can filled with fluid with the plug off.