search.noResults

search.searching

note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
OTORCRAFT CHECKRIDE Training Musings


Post-Maintenance Preflight


Take a Closer Look By Randy Rowles


P


rior to the flight portion of an FAA exam, the applicant will be tested on their knowledge and ability to conduct a preflight on the aircraft being tested. It is imperative that a pilot understand the systems of the aircraft they plan to operate. The ability to determine airworthiness can only be accomplished when the pilot has adequate knowledge of their aircraft and knows what to look for (normal vs. abnormal) during the preflight process.


A few weeks ago, I was picking up an aircraft that had just completed a heavy maintenance inspection. Many of the aircraft’s flight components had been removed, overhauled, and reinstalled. Before I conduct an operational check flight (OCF), I like to establish a personal relationship with the maintenance staff working on the aircraft. Having conducted many post- maintenance OCFs, I’ve grown accustomed to the nuances of maintenance technicians and appreciate that each maintenance facility’s processes and procedures may differ. In the case of the aircraft in question, I did not know all of the mechanics. The main gearbox and rotorhead was completed by a mechanic new to the facility. Since this situation occurs often within our industry, it gave me no great concern; I had faith and trust in the quality assurance process of the system.


The aircraft was rolled outside and prepped for its required CFR 14 91.407 return-to-service operational check flight. Having verified the maintenance tool and parts inventory (All tools and parts utilized during aircraft maintenance were accounted for.), I checked all the aircraft logs for the appropriate endorsements and proceeded to preflight the aircraft.


The preflight went well, with only a few discrepancies that were quickly remedied. After a few flight manual updates that were due, I was ready to go. Before I get into any aircraft, I walk around verifying cowlings to be closed and just make sure I didn’t miss something obvious.


As I stepped up on the flight step, I happened to look up at the swash plate. Immediately I noticed something I had missed on the preflight: Each bolt on the rotating portion of the swash plate was put in backwards. On this portion of the swash plate, the head of the bolt is to be in the direction of rotation. It is a safety design and procedure so that the bolt will be driven into the hole during rotation, not thrown out of it due to centrifugal force.


I pointed out this discrepancy to the maintenance manager. The aircraft was immediately returned to the hangar, where all of the rotating bolts were removed and reinstalled in the correct direction. Still, I needed to know: How did this happen?


The answer was that the new mechanic had previously only worked on helicopters with rotor systems that turned in the opposite direction. When queried on what had happened, he admitted that he just put the bolts in “from left to right out of habit.” It was a simple human error ... that completely eliminated a safety design to prevent catastrophic failures.


Either after maintenance, or when just going out on your next


flight, make no assumptions when conducting a preflight on an aircraft. It’s definitely worth the few moments it takes to have a closer look.


Your life may depend on it.


Randy Rowles has been an FAA pilot examiner for 20 years for all helicopter certificates and ratings. He holds an FAA Gold Seal Flight Instructor Certificate, NAFI Master Flight Instructor designation, and was the 2013 recipient of the HAI Flight Instructor of the Year Award. Rowles is currently director of training at Epic Helicopters in Fort Worth, Texas.


82 Sept/Oct 2016


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86