Narrative:

Our aircraft (#1) arrived at ZZZ with an oil leak. Maintenance cleaned the oil and stated that it was caused by an over service of the pgb [propeller gear box]. They did not do a runup before we departed for ZZZ2. After arriving in ZZZ2; we noticed that oil had streamed all the way down the engine cowling and was leaking on the ground. Contract maintenance was contacted. While the mechanic was inspecting the engine he discovered that I had ingested a bird into the right compressor. After he cleaned the aircraft and inspected the compressor for damage; we flew back to ZZZ. The mechanic at ZZZ2 said he also thought the pgb was over serviced. During our postflight in ZZZ after we returned; we discovered that oil had coated the entire right engine cowling again. At this point; that aircraft was grounded and we were switched into another aircraft (#2). This aircraft was pulled out of the hanger after an aging aircraft inspection.during our morning checks the circuit breaker for the flight data acquisition unit blew. The breaker could not be reset. Maintenance was able to defer the fdr (flight data recorder); but only after FAA approval. After we departed for ZZZ3; we began getting master cautions for the rudder limiter and I then noticed that the standby airspeed indicator was indicating 25 KTS faster than the captain's and first officer's. Also; after we were cleared direct to the airport VOR; we discovered that both navigation receivers were not functioning; thus we requested radar vectors from ATC and informed them that we had no navigation capability with the exception of the ADF. Thankfully; the weather was VMC and we were able to land in ZZZ3 with a visual approach.during our postflight inspection; my first officer noticed that oil had leaked from the left engine and had streamed all the way back to the exhaust pipe. At this point; I recorded the squawks into the logbook and went to the hotel. Maintenance thought that the original leak on aircraft #1 was an over service problem. Aircraft #2 was taken out of the hanger before it was ready to return to service; in my opinion. Dispatch and maintenance control were contacted after every problem was discovered by my crew.

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Original NASA ASRS Text

Title: An SF340 Captain reported numerous aircraft anomalies and failed maintenance procedures encountered with two aircraft during one long day at work.

Narrative: Our aircraft (#1) arrived at ZZZ with an oil leak. Maintenance cleaned the oil and stated that it was caused by an over service of the PGB [Propeller Gear Box]. They did not do a runup before we departed for ZZZ2. After arriving in ZZZ2; we noticed that oil had streamed all the way down the engine cowling and was leaking on the ground. Contract maintenance was contacted. While the Mechanic was inspecting the engine he discovered that I had ingested a bird into the right compressor. After he cleaned the aircraft and inspected the compressor for damage; we flew back to ZZZ. The Mechanic at ZZZ2 said he also thought the PGB was over serviced. During our postflight in ZZZ after we returned; we discovered that oil had coated the entire right engine cowling again. At this point; that aircraft was grounded and we were switched into another aircraft (#2). This aircraft was pulled out of the hanger after an aging aircraft inspection.During our morning checks the circuit breaker for the Flight Data Acquisition Unit blew. The breaker could not be reset. Maintenance was able to defer the FDR (Flight Data Recorder); but only after FAA approval. After we departed for ZZZ3; we began getting master cautions for the rudder limiter and I then noticed that the standby airspeed indicator was indicating 25 KTS faster than the Captain's and First Officer's. Also; after we were cleared direct to the airport VOR; we discovered that both navigation receivers were not functioning; thus we requested radar vectors from ATC and informed them that we had no navigation capability with the exception of the ADF. Thankfully; the weather was VMC and we were able to land in ZZZ3 with a visual approach.During our postflight inspection; my First Officer noticed that oil had leaked from the left engine and had streamed all the way back to the exhaust pipe. At this point; I recorded the squawks into the logbook and went to the hotel. Maintenance thought that the original leak on aircraft #1 was an over service problem. Aircraft #2 was taken out of the hanger before it was ready to return to service; in my opinion. Dispatch and Maintenance Control were contacted after every problem was discovered by my crew.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.