With a Grain Of SaltBy FRANK MOOREOn April 19 a Piper Cherokee took off from Palm Springs with four people aboard, destined for Santa Marta. It never arrived.Last Thursday, while looking for another lost aircraft, the Civil Air Patrol. spotted thewreckage. It was only IS milesnorthwest of Palm Springsairport on a mountainside.When I was at Civil Air Patrol search headquarters in Chino Sunday, Capt. Charles L. Burrell alluded to that wreck three times. In each instance he called it “the Israeli plane”. Not wanting to get him off onto a second subject, I never asked him why he used that term — but I certainly wondered about it.Lt. Mary Knorr, CAP public information officer, happened to phone me yesterday and I asked her about the Israeli aspect of the case.“We usually terminate a search after 10 days if we have not found the plane by then,” she said. “But the pilot was an exchange student from Israel and Israel might have been unhappy with us if we did not locate the crash.“We found it on the 34!h day.”When ! telephoned the public information office at Cal Poly, San Luis Obispo, I got a slightly different version. The expert on the subject did not happen to be in, but his assistant believes this is approximately the way it was.Zvi David Argov, 26, was indeed a student from Israel. But that was not the ex-planation of the word to CAPfrom higher authority to extend the search.Areov was a licensed com-