Narrative:

Flying a cessna caravan picking up cargo in ZZZ and ZZZ1 and delivering it to ZZZZ.in ZZZ; I loaded the larger boxed hazmat in cargo pod 2. I could not fit all the hazmat in cargo pod 2; so I also loaded the rest of the hazmat in the topside cargo compartment. Like every stop I make; I double check the cargo door; cargo pods and tail stand to ensure everything is secure before departing. Next stop was ZZZ1 where I loaded pods 1 and 3; not adding anything in cargo pod 2 nor touching the cargo pod door 2 at all. Again; after everything was loaded; I doubled checked the cargo door; cargo pods and tail stand to ensure everything was secure. When departing ZZZ1 everything was normal and I did not notice or feel any doors or pods opening. At 59 miles away from ZZZZ in normal cruise I felt a vibration on the floor of the cockpit as well as the sound of pressure change below the floor. This is what I believed to have been a cargo pod opening. I immediately powered down to 120 knots and trimmed the left wing high to keep anything from falling out of the cargo pods. I made sure to make careful adjustments in the airplane and made sure not to make any turns to the left to avoid boxes falling out of the pods. This is why I landed straight in at ZZZZ. I'm uncertain how the cargo pod door 1 and 2 both opened up as they were closed; locked and double checked prior to departing. In cargo pod 1 was large boxes of non-hazmat cargo. In cargo pod 2 was the hazmat cargo. The company (where cargo was being delivered) informed my company that they have received all hazmat that I was carrying; but are unsure of other cargo. To my knowledge; I don't believe any cargo fell out of the airplane as the majority were large heavy boxes in the cargo pod compartment and were still full upon landing.

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Original NASA ASRS Text

Title: C208 pilot reported the cargo pod door during flight. The pilot landed normally and did not detect any missing cargo from the compartment.

Narrative: Flying a Cessna Caravan picking up Cargo in ZZZ and ZZZ1 and delivering it to ZZZZ.In ZZZ; I loaded the larger boxed HAZMAT in Cargo Pod 2. I could not fit all the HAZMAT in Cargo Pod 2; so I also loaded the rest of the HAZMAT in the Topside Cargo Compartment. Like every stop I make; I double check the Cargo Door; Cargo Pods and Tail stand to ensure everything is secure before departing. Next stop was ZZZ1 where I loaded Pods 1 and 3; not adding anything in Cargo Pod 2 nor touching the Cargo Pod Door 2 at all. Again; after everything was loaded; I doubled checked the Cargo Door; Cargo Pods and Tail stand to ensure everything was secure. When departing ZZZ1 everything was normal and I did not notice or feel any doors or pods opening. At 59 miles away from ZZZZ in normal cruise I felt a vibration on the floor of the cockpit as well as the sound of pressure change below the floor. This is what I believed to have been a cargo pod opening. I immediately powered down to 120 knots and trimmed the left wing high to keep anything from falling out of the Cargo Pods. I made sure to make careful adjustments in the airplane and made sure not to make any turns to the left to avoid boxes falling out of the pods. This is why I landed straight in at ZZZZ. I'm uncertain how the Cargo Pod Door 1 and 2 both opened up as they were closed; locked and double checked prior to departing. In Cargo Pod 1 was large boxes of non-HAZMAT Cargo. In Cargo Pod 2 was the HAZMAT Cargo. The company (where Cargo was being delivered) informed my company that they have received all HAZMAT that I was carrying; but are unsure of other cargo. To my knowledge; I don't believe any cargo fell out of the airplane as the majority were large heavy boxes in the cargo pod compartment and were still full upon landing.

Data retrieved from NASA's ASRS site 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.