ACR HAS COWLING UNLATCH; EMER LNDG. FINDS ARPT INFO ON CHART IS WRONG.

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THE REASON FOR THE EMER LNDG WAS DUE TO LOSE COWLING ON THE L ENG; SOME VIBRATION WAS FELT ON THE YOKE. THE LNDG WAS UNEVENTFUL. MY PRIMARY CONCERN IS THE ACCURACY OF THE WAC CHART. 1) IT INDICATES AS A CTL TWR WITH A FREQ OF 118.9. IT HAS BEEN UNCTLED FOR 2 1/2 YRS. 2) IT ALSO INDICATES THE ARPT IS AN ARPT OF ENTRY; THAT HASN'T BEEN THE CASE SINCE 1989. ALL OF THIS INFO I OBTAINED FROM THE ARPT MGR. ACCURACY OF THE CHART IS AN IMPORTANT FACTOR FOR DETERMINING WHICH ARPT IS TO BE USED IN AN EMER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES HE WAS IN CONTACT WITH APCH CTL BUT UNABLE TO CONTACT ANYONE ELSE. NOT SURPRISING IF TWR OUT OF OP FOR SO LONG. HE ALSO STATES THAT ONE RWY IS COVERED WITH ROCKS AND IS TOTALLY UNUSABLE. (THIS INFO IS NOTED IN THE ARPT FACILITY DIRECTORY.) ALSO MENTIONED THAT HIS CHART SHOWS AN NDB WHICH DOES NOT EXIST. THE CHART ANALYST (CURRENT) DOES NOT SHOW NDB. UPON LNDG TO SECURE THE ENG COWLING; RPTR NOTED ABOVE MENTIONED PLUS THE FACT THAT THE AREA WAS BURNED SOME TIME AGO AND THERE IS LITERALLY NOTHING THERE; NO SVCS AT ALL. ANALYST CONTACTED THE VISUAL CHARTING OFFICES IN WASHINGTON AND THEY ARE CHKING OUT THE SIT AND WILL GET BACK TO US. OF COURSE THE INFO ON THE CHARTS IS UPDATED BY A FORM SENT TO THE ARPTS AND RETURNED TO THE MAPPING FACILITIES. SUCH INFO IS ACCEPTED AS FACTUAL AND PLACED ON THE CHARTS. THIS INFO IS OBVIOUSLY MUCH OUTDATED.