No, it is not. The word landed in this context is a verb, the past tense of 'to land' (aircraft). However, safely is indeed an adverb.
Adverbs that can be used for the verb landed include safely and gently.
An adverb phrase is two or more words that act as an adverb. It would be modified by an adverb or another adverb phrase.
adverb phrase
Adverb Phrase
No. But the prepositional phrase "in it" is an adverb phrase.
adverb
It is an adverb phrase (tells where).
An adverb phrase is two or more words that act as an adverb. It would be modified by an adverb or another adverb phrase.
adverb phrase
Adverb phrase
It is a prepositional phrase functioning as an adverb. Hint: A word or phrase that answers the question 'Where?' is functioning as an adverb (I think).
adverb phrase