|Bulbs for airpath compasses.|
Be aware that the Airpath compasses use a centre negative bulb housing. That is, the outer casing of the holder is normally the positive terminal. I presume this is the prevent the flip lid holding the bulb in from being live to the touch. This is the opposite of convention where bulbs are generally centre positive. These are found in most but not all post lights, for example, some Beechcraft use a centre negative bulb in their post lights. This difference can be important if you are considering replacing your GE 330 bulbs with LED equivalents that are polarity sensitive.