One I feel we were fortunate that the weather was nearly perfect at an airport I am very familiar with. Note: my ipad was in airplane mode during the flight.a few points to note here. However once connected to the company network the jeppfd-pro app opened normally and all functions worked correctly. After the flight I proceeded to ord flight operations to attempt to re-download the app. We continued to an uneventful landing and taxied to the gate. At this point I took the aircraft back mentioned my failed jeppfd-pro app to the first officer and asked him to pay particular attention to any ATC instructions out of the ordinary as he had a working jeppfd-pro opened and ready to go. I selected the jeppfd-pro app and once again received the error message. A few seconds later the ipad was up and running again. Believing an ipad restart was just as safe and quick at that point in time as pulling out the charts I shut down and restarted the ipad. We were prepared for the approach and the weather was cavok. At this point I handed the aircraft over to the first officer and told him I was going to reset the ipad or get out a chart. I reselected the app and received the same error message again. Until this developer has been trusted their enterprise apps will not be available for use.'I then closed the error message double-clicked the home button and closed the jeppfd-pro app. Upon 'waking up' the ipad I selected the jeppfd-pro app and received the following error message:'iphone distribution: jeppesen sanderson inc. Sometime during the downwind leg to ord 9L my ipad went into screen saver/sleep mode.
![jeppfd ipad serial jeppfd ipad serial](https://docplayer.net/docs-images/47/20939780/images/page_5.jpg)
I am writing this report to highlight a particularly concerning failure of the jeppfd-pro app at around 4000 feet on approach to ord runway 9L.
![jeppfd ipad serial jeppfd ipad serial](https://www.ainonline.com/sites/ainonline.com/files/styles/ain30_fullwidth_large_2x/public/uploads/2013/10/249img_0109.jpg)
Unexpected jeppfd-pro app failure on approach.