ለምሳሌ፣ በአለፈው ዓመት በአንዱ የውሂብ ማዕከላችን ላይ መደበኛ የጥገና ስራ እያከናወነን ሳለ የሆነ ያልተለመደ የፍለጋ ትራፊክ አግኝተናል።
For instance, on occasions during the last few years we had asked one of the civil aircraft companies to carry out fourth line maintenance on one of our Viscounts.